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a4bc89c39212aa49b5b4133fa53d72be | 1) india plays two matches each with west indies and australia.in any match probabilities of india getting points 0,1 and 2 are 0.45,0.05 and 0.50 respectively.aasuming that the outcomes are indipendent,the probability of india getting 7 points ,is............ please reply soon................. | askiitians.com | 2021.25 | [
{
"text": "for india to get 7 points it must win 3 matches and draw one match so prob of dat is .5*.5*.5*.05 as dis cane be done in 4 ways (india can draw any of the four matches ) so multipy it wid 4 den it becomes 1/2*1/2*1/2*1/20*4 giving answer as 1/40 please tell me if u r satisfied",
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c6212dd2e9db9e18e42a9362d3883918 | 74. resistance of an incandescent filament of a lamp is comparatively much more than that when it is at room temperature. why? [hots] | askiitians.com | 2021.31 | [
{
"text": "answer: explanation: when bulb is switched on (i.e., incandescent state), the temperature of filament rises. as the temperature increases, the resistance of conductor also increases.",
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5f003d7c806e06f9d0857d52a7819a46 | explain the reactions taking place in dry cell and mercury cells? | askiitians.com | 2021.21 | [
{
"text": "mercury cells mercury batteries are small, circular metal batteries that were used in watches. mercury cells offer a long lifetime in a small size but the mercury produced as the cell discharges is very toxic. mercury cells only produce 1.3 volts. hgo +zn +h2o ------>hg +zn(oh)2 +lectrical energy dry cell a dry-cell battery uses an immobilized electrolyte that minimizes moisture and allows for superior portability. a common dry cell battery is zinc-carbon battery zn +2mno2 +2nh4(aq)------>mn2o3(s) +h2o(l) +zn2 +2nh3(g) e0=1.5v",
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726da718f77e327e801d813633eadc7f | find the number of solutions of cosa+tana=1,where a belongs to [0,2pi]-{pi/2,3pi/2} | askiitians.com | 2021.25 | [
{
"text": "dear student the two solutions can be easily observed as a= 1 and 2pi you can also get them by putting cosa in terms of tana/2 and also tana in terms of tana/2 by the same above method you will get third root in between pi and 2pi. so, total 3 solutions would be there thanks",
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6b51fed73cf9ab8d22189c498470e35d | the normal to the curve 5x^5-10x^3+x+2y+6=0 at the point p(0,-3) is tangent to the curve at some other points.find those points?? | askiitians.com | 2021.31 | [
{
"text": "differentiating curve equation 25x 4 – 30x 2 + 1 + 2m =0 2m= 30x 2 - 25x 4 – 1 m =15x 2 – (25/2)x 4 – 1/2 m (0,-3) = -1/2 so slope of normal at p(0, -3) = -1/m (0,-3) =2 it is also tangent to curve at some points (x,y) then m (x,y) = 2 =15x 2 – (25/2)x 4 – ½ so 3 = 30x 2 – 25x 4 25x 4 - 30x 2 +3 = 0 solve this equation for value of x and then put value of x in equation of curve to find value of y.",
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"text": "dear aayushi let us assume the question as: the normal to the curve 5x 5 - 10x 3 + x + 2y + 6 = 0 at point (0, -3) is tangent to the curve at some other point. find the point ? to solve this, we first have to find the equation of normal to the given the given curve at the point (0, -3). for that, we need to differentiate the equation of the curve and find the gradient. the gradient of the given curve will be: 25 x⁴ - 30 x² +1 + 2dy/dx = 0 now value of gradient at (0 , -3) dy/dx = -1/2 let as assume the value as m 1 = -1/2 we also know that slope of the normal will be: m 2 = (-1 / m 1 ). hence, m 2 = 2. so, equation of the normal can be found by using point slope form: (y - y 1 ) = m 2 (x - x 1 ) (y - (-3)) = 2 (x - 0) y + 3 = 2x y = 2x - 3 ---------- (i) according to the question, equation (i) is also tangent to the given curve. we can plug in the value of y from equation (i) into the equation of the curve. so, we get: 5x 5 - 10x 3 + x + 2(2x - 3) + 6 = 0 5x 5 - 10x 3 + x + 4x - 6 + 6 = 0 5x 5 - 10x 3 + 5x = 0 5x(x 4 - 2x 2 + 1) = 0 x 4 - 2x 2 + 1 = 0 x 4 - x 2 - x 2 + 1 = 0 x 2 (x 2 - 1) - 1(x 2 - 1) = 0 (x 2 - 1) 2 = 0 x = 1 plugging in the value of x = 1 in equation (i). we get, y = 2 - 3 = -1. hence, the required point is (1, -1). regards arun (askiitians forum expert)",
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b641cb84daa157aa666df208fa14c7fd | what is true about the first living organism they originated in an oxidising atmosphere thaey were aerobic made their own food obtained energy by fermentation of organic molecule | askiitians.com | 2021.25 | [
{
"text": "obtain energy by fermentation of organic food",
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{
"text": "obtain energy by fermentation of organic food",
"name": "",
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{
"text": "obtain energy by fermentation of organic food",
"name": "",
"is_accepted": false
},
{
"text": "obtain energy by fermentation of organic food",
"name": "",
"is_accepted": false
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400fbbda577e8e96034f22b83dcdef5c | the contituent wave of a stationary wave have amplitude, frequency and velocity as 8 cm, 25 hz and 150 cm/s respectively. what is the amplitude of the stationary wave at x = 2 cm ? | askiitians.com | 2021.25 | [
{
"text": "the question can be solved by drawing a graph or either by usin the below stated method : find the wavelength of the wave velocity = wavelength × frequency 150 cm/s = wavelength × 25 hz wavelength = 150 ÷ 25 => wavelength = 6 cm a crest and a trough make one wavelength on comparing with the sine wave, 180° = 6 cm and hence value of 1 i.e. maximum value = 8 cm => 60° = 2cm => sin 60° = root (3) / 2 if 1 = 8cm => { sqrt (3) / 2 }= 8 × sqrt (3) / 2 cm => at x = 2cm amplitude = 4 × sqrt (3) regards arun (askiitians forum expert)",
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"text": "but the answer is 8√3 ,..............................................................................",
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d180492795d7c3715daf28f0d462ac33 | iit kanpur civil or iit roorkee mechanical | askiitians.com | 2021.39 | [
{
"text": "dear nakul patel, please exchange the branches, then everything will be perfect, but iit roorkee mechanical is a good option......... good luck!!!!!!! plz. approve my answer by clicking 'yes' given below, if ypo loved it!!!!!!!! don't forget it..... please.........",
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0cbb9aa217e7ec6f30689cb911951435 | a stone weighting 0.5kg falls from a height and strikes the ground in 4 seconds. it buries deep in sand in 0.09 seconds. the depth of penetration is (g=10m/s 2 ) a) 100m b) 2.0m c) 1.8m d) 0.9m | askiitians.com | 2021.31 | [
{
"text": "dear student, velocity of stone when it reaches the ground= u+at=40m/s the stone stops in 0.09seconds. therefore from third equation of motion, therefore the distance travelled=",
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8fc2d2b714ff6f485fb43700e3e86d83 | if f is an even function defined on the interval mentioned in the image then the total number of real values of x satisfying the given equation. | askiitians.com | 2021.31 | [
{
"text": "one possibility would be x = (x+1)/(x+2) solving which you will get two valid solutions. another possibility would be – x = (x+1)/(x+2) … since f is even solving this also you will get two different solutions. hence there are 2+2= 4 solutions",
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048212962dcb2c0060cfbe343ed722fc | how to solve integration of one upon square root of log x | askiitians.com | 2021.31 | [
{
"text": "log(x)=y x= e^y dx=e^y dy ∫ (1/ √y e^y dy it seems like gamma function , which is in the form of ∫ x^(n-1) e^-x dx take y=p ∫ 1/ √p e^-p (-dp) = -i ∫ 1/ √p e^-p dp = -i √π √log x + c where ‘i’ is imaginary part ..",
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8cefd2cac45a5ab3e73f0130dbb0a71d | a place where animals are protected in their natural habitat is called | askiitians.com | 2021.43 | [
{
"text": "dear student a place where animals are protected in their natural habitat is called wildlife sanctuary. thanks",
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caa73387f674691b2863f10f1ead55df | i want the know the solution of all three parts.plz help as soon as possible. | askiitians.com | 2021.39 | [
{
"text": "for the 1 st question we will get 2 br’s on middle carbon and 2 h’s on right end carbon ch 3 -cbr 2 -ch 3 for the 2 nd question we will get hydroxyl group on benzyl carbon then after on rearrangement we get ketone gp as ph-co-ch 2 ch 3 because hgso 4 &h 2 so 4 gives markonikov product. for the 3 rd question we will get 2 br’s on two double bonded carbons and it is anti addition we get as ch 3 -ch 3 -chbr-chbr-ch(ch 3 ) 2",
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68df688cb8ff955fca153777f751a113 | i got rank 2943 in jee. what will be my best option. i like the old iits | askiitians.com | 2021.39 | [
{
"text": "b tech text at delhi chemical at bhu & guwahati",
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"text": "according to my calculations, its better to go for ece or mech at iit(bhu) varanasi(formerly it bhu) as it is officially an iit now. you can check dis bill has been passed by rajya sabha on 30 april 2012. and dis year d avg placements of mech or ece in iit bhu is very gud and iit bhu will overtake iit roorkee in a couple of years (its already ahead of iit guwahati) so u shud opt fr cse dere. my best wishes are wid u plzz approve my answer by pressing yes if u liked my answer.",
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c11b7ff2ac76b8e579905ad4a0ef979e | derrive expression for torque? | askiitians.com | 2021.31 | [
{
"text": "dear student please find the link attached https://www.askiitians.com/revision-notes/physics/circular-and-rotational-motion/ regards",
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1a71817ede6af6ff09e5e3ed7020c382 | do all the stars in the sky move? explain. | askiitians.com | 2021.43 | [
{
"text": "no, all the stars do not move in the sky. due to the rotation of the earth on its own axis stars seem to move in the sky.",
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4977249d0a0fc21460979f294753c76e | if the curve ( equation in image) has its local extremum at x=d then 0 -3 image attached . | askiitians.com | 2021.39 | [
{
"text": "ans: hello student, please find answer to your question below to find maxima & minima if you just need to find the point of minima, then is minima. because so. x = -3 is the minima.",
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fce763591eb7414494331a2153b0f609 | two particles a & b are initially located at same point in uniform gravitational field of earth.at a certain moment they are projected with speeds v1 & v2 horizontally in opposite directions.the separation between them at a moment when their velocity vector become perpendicular to each other is?? | askiitians.com | 2021.25 | [
{
"text": "here, initial velocity of the first projectile = v 1 initial velocity of the 2nd projectile = v 2 angle of projection of first projectile = 0 0 angle of projection of first projectile = 180 0 (since both are horizontal projectiles) horizontal displacement of the first projectile x 1 = v 1 t horizontal displacement of the 2nd projectile x 2 = -v 2 t thanks & regards mukesh sharma askiitians faculty",
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"text": "horizontal velocity of particle will remain same -v1i,v2i verticle velocity -gt,-gt taking dot product we get t^2=v1*v2/g^2",
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d2425a4310452da9e635f827b788a5f3 | prove lhs = rhs (tan a + sec a – 1)/ (tan a – sec a + 1) = sec a + tan a | askiitians.com | 2021.25 | [
{
"text": "multiplying denominator and numerator by we get,",
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"text": "if (x / y ) = z to be proved equivalently it is enough to show x = y * z here y = tan a – sec a + 1 and z = sec a + tan a and x = tan a + sec a – 1 y * z = tan 2 a – sec 2 a + ( sec a + tan a) = sec a + tan a -1 -prakash vaithyanathan science and math tutor chennai",
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"text": "amit tiwari preparation for iit form kanpur. (kakadev)[tana + seca - 1] / [tana-seca+1]= [ tana + seca - (sec2a-tan2a) ] / [tana-seca+1] [using: sec2a-tan2a=1]= [ (tana+seca) - (seca+tana)(seca-tana) ] / [tana-seca+1] [using: a2-b2=(a+b)(a-b)]= [ (seca+tana)*(1- (seca-tana) ) ] / [tana-seca+1] [taking (seca+tana) as common]= [ (seca+tana)*(1-seca+tana) ] / [tana-seca+1]= [ (seca+tana)*(tana-seca+1) ] / [tana-seca+1]= seca + tana= (1/cosa) + (sina/cosa)= (1+sina)/cosa [taking lcm]",
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"text": "amit tiwari preparation for iit from kanpur (kakadev)[tana + seca - 1] / [tana-seca+1]= [ tana + seca - (sec2a-tan2a) ] / [tana-seca+1] [using: sec2a-tan2a=1]= [ (tana+seca) - (seca+tana)(seca-tana) ] / [tana-seca+1] [using: a2-b2=(a+b)(a-b)]= [ (seca+tana)*(1- (seca-tana) ) ] / [tana-seca+1] [taking (seca+tana) as common]= [ (seca+tana)*(1-seca+tana) ] / [tana-seca+1]= [ (seca+tana)*(tana-seca+1) ] / [tana-seca+1]= seca + tana= (1/cosa) + (sina/cosa)= (1+sina)/cosa [taking lcm]",
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8947f959f6a23895323b625ebd6c2b4d | if instantaneous current in a circuit is given by i=(2+3sinwt)a,then the effective value of resulting current in the circuit is what answer pls explain me with solution | askiitians.com | 2021.39 | [
{
"text": "hii the question is asking you to find out the value of rms current in one complete cycle . multiply the maximum value by 0.7010 which is 1/sqrt(2) * maximum amplitude . presence of a contant value will just change the base uopn which the sinusoid travels.",
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bf240fb5ab8750058fe7d03af16c16c7 | a vector of magnitude 10 has its rectangular components as 8 and 6 along x and y axes.find the angles it makes with these axes | askiitians.com | 2021.31 | [
{
"text": "the vector is having the x-component as 8 and y-component as 6.so it`s angle with the axis will be tan (theta) = y-component/x- component = 6/8=3/4 so (theta) = tan-1 (3/4)",
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32dfcd05655827ffd318ffc339366233 | what are the in the phylum exceptions in ctenophora | askiitians.com | 2021.25 | [
{
"text": "exceptions are juveniles of two species, which live as parasites on thesalpson which adults of their species feed.",
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bcacebda62810c9298d3247c183a17ea | my rank in iit jee 2010 is 5139 will i get mechanical civil electronics electrical or computer engineering in any iit? | askiitians.com | 2021.43 | [
{
"text": "hi, congrates for good score .. you can definaly make it to old iits... yes, you will get the good branch in old iits check out the opening and closing ranks of different iits: http://www.askiitians.com/iits-2009-2010-opening-and-closing-rank.aspx please feel free to post as many doubts on our disucssion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best . regards, askiitians expert vijayluxmi",
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373d12edf0d040dc3009b55c56f0e28b | why dont we consider hydrogen as a meta? | askiitians.com | 2021.25 | [
{
"text": "in general its is a non metal but metallic hydrogen is found at ultra low tempratures,,",
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3b2662bfb004e4adaed0b125baa5caf7 | sir,i expect 10 in maths(jee-2010).can i be in cml????????????????????? | askiitians.com | 2021.25 | [
{
"text": "dear ripan this year expected cutoff for maths is 8-10 for eneral category . so you are in very critical position. however score may vary and as a result rank may also vary, a slight difference may create lots of difference in rank. for further details you can visit the following: http://www.askiitians.com/iit-jee-2010-cut-offs.aspx please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best. regards, askiitians experts badiuddin",
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0bdb660d8e72ed98d2a36a8c461c76e3 | vapour pressure of a liquid in a closed container does not depend upon: ? | askiitians.com | 2021.43 | [
{
"text": "in a closed container, the vapour pressure of a liquid depends entirely on its temperature. when the vapour pressure is stable at a stable temperature, the liquid and its vapour are said to be 'in equilibrium'. (equilibrium is achieved when..'the number of molecules leaving the liquid into the vapour phase, is equal to the number returning to the liquid phase from the vapour'). any change in temperature will break the equilibrium and the vp will change accordingly. only when the liquid re-stabilises at a new temperature, will the vp re-stabilise at the new equilibrium pressure. please approve my answer!!",
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384118e8da55a7be255b7343496baddf | please help me solve this....................................thankyou | askiitians.com | 2021.39 | [
{
"text": "apply integration by parts. u=arccosx and v=x^2 so integral becomes arccosx *x^3/3 – ∫( – 1/(1-x^2)^0.5)*x^3/3dx now all we gitta do is to solve this: ∫(1/(1-x^2)^0.5)*x^3dx put (1-x^2)^0.5=z so that 2zdz= – 2xdx so integral becomes ∫– (1-z^2)dz which is elementary :)",
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c13bc10dc6ada49267ff2e3f201c80c3 | sir, which will be a good choice?mech. or chemical in it-bhu or paper & pulp engg. in iit roorkee? | askiitians.com | 2021.21 | [
{
"text": "i would suggest to go for mech. / chem in it bhu ... even in iit its difficult ti get plcmnt with pulp& paper tech,. in core industry in iit one more advantage is, you can sit for open2 all companies eligiblity with b tech degree but thr u have to prove urself for which u need gud communication skills and a gud gpa and some leadership qualities. but in time, its difficult for you in iits with this degree and going for non-core companies i suggest go for mech.chem at it bhu which has gud plcmnt statistics all the best -- regards ramesh",
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bb2c99752b37edfd8042876356a75e5c | the maximum value of the expression 1/sin^2a+3sinacosa+5cos^2a | askiitians.com | 2021.31 | [
{
"text": "multiply the numerator and the denominator by 2 numerator will become 2 & the denominator = 2sin^2a+6sinacosa+10cos^2a taking a (sin^2a + cos^2a) aside we get = sin^2a +6sinacosa +9cos^2a + sin^2a + cos^2a = (sina + 3 cosa)^2 + sin^2a +cos^2a = (sina + 3 cosa)^2 + 1 now the expression becomes 2/( (sina + 3 cosa)^2 + 1 ) for the maximum value of the expression the denominator must be minimum and for denominator to be minimum , (sina + 3 cosa)^2 must be minimum the minimum value of , (sina + 3 cosa)^2 can be zero when tana = -3 therefore the maximum value of the expression 2/( (sina + 3 cosa)^2 + 1 ) = 2/( 0 +1 ) = 2 if you want to aprreciate the solution , please click below on approve.",
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"text": "dear smit, sanatan is right!! its the right answer.",
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{
"text": "cosec^2(a)+5(cos^2(a))",
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6280768f57ade6d425fe0ab89705e801 | i am scoring 223 in aieee 2011. should i go to attend vit(vellore) counseling on 1st june. i secured 2800 rank there. | askiitians.com | 2021.21 | [
{
"text": "i dont thnk so.. if u havcounted ur marks properly u will get somethng gud in aieee wich is far better than vellore. plzzzz approve d answer if u like it",
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3a34c07f21e368d02d98dd1af0a6d5a1 | hi, i am getting a good branch(cs) in bitsgoa as well as (cs) in nit surathkal. which college would you suggest me and is computer science(cs) a good choice? what other branches can i opt for? which do you think is a better college between bit goa and nit surathkal and why? i need the reasons for which one is better. bits marks-314 aieee marks-230 | askiitians.com | 2021.25 | [
{
"text": "opt for nitk , u have an excellent campus and faculty , (look at pics of students on facebook), and nitk boast one of the best alumni in india",
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9fa9353c309004b87110ee6ea8d497b6 | between monkey and dolphine which is more capable in identify of objects? | askiitians.com | 2021.25 | [
{
"text": "i think that dolphins are more capable to identify objects.they have well-developed hearing which is adapted for both air and water",
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284a1188cfee2a0ecabe9c2e59a41cc0 | i am alloted mechanical engg. at bit mesra. i may get civil engg. or automobile engg. or engg. physics or polymer & chem. engg. at dtu. where should i go? which is a better college in terms of placements? | askiitians.com | 2021.25 | [
{
"text": "dear akash if you can get automobile engg in dtu go for it for sure.for the remaining best would be decide on your interest likw hich subject you like most.because all of them you can say at same average...rather than branch and college your performance matter in them.if you dont have any preference i would say for mech in bit mesra please feel free to post as many doubts on our discussion forum as you can.we will get you the answer and detailed solution very quickly. all the best. regards, askiitians experts prudhvi teja now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian",
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e5d2dd01936634ae6cc766387574398d | out of 480, how many marks should i get to ensure a seat in jee? can anyone tell me the cut-off marks for different branches? | askiitians.com | 2021.25 | [
{
"text": "common merit list rank aggregate marks 1 424 501 302 1001 278 1501 262 2001 249 2501 239 3001 230 3501 223 4001 216 4501 211 5001 205 5501 200 6001 196 6501 191 7001 187 7501 184 8001 180 8295 178 obc category rank aggregate marks 1 413 101 282 201 260 301 244 401 231 501 223 601 216 701 210 801 204 901 199 1001 194 1101 190 1201 186 1301 181 1401 177 1501 174 1601 171 1701 167 1801 164 1901 161 1930 161 sc category rank aggregate marks 1 326 101 170 201 146 301 132 401 121 501 112 601 105 701 99 801 95 901 91 967 89 st category rank aggregate marks 1 319 101 114 201 91 208 89 pd category rank aggregate marks 1 289 101 108 138 89",
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"text": "marks / rank 410-469 / top10 410-300 / 10-1000 300-250 /1000-2000 250-200 /2000-4000 for obc quota cutoff wil be around 170 marks for rank 4000. -- regards ramesh",
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8adea9c29cde23a7ed7752c49b505355 | sir, my aieee rank is 41127( category) and 54290( overall). my home state eligibilty is chhattisgarh. my state rank 490(category) and 621 (overall). which colleges i might get at this rank.???????? also provide me with the list of colleges that use aieee ranks for admission. please help me sir. | askiitians.com | 2021.25 | [
{
"text": "dear snehil, your rank is not good enough for you enogh to fetch you a college through aieee. refer to the link below to get the list of colleges and the branch you would be getting at any of the colleges : - www.askiitians.com/aieee-counselling/aieee-engineering-counsellings.aspx thank you.",
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fbf5e2c97bdb28dd4088f49cfa397d3e | 83. why did mendeleev’s left some gaps? | askiitians.com | 2021.31 | [
{
"text": "answer: explanation: these gaps were left for undiscovered elements.",
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7cd0e45e67222dca7ce5c506c94fbf91 | nits have increased the intake by 54%. do you think it will cause any harm to its brand name? earlier the last fellow(gm) to get a seat in eee through state quota in nitk was 9000 and now it has increased to 28000. | askiitians.com | 2021.25 | [
{
"text": "nit have increased the seats but with this they are also recruiting the faculties to meet the requirement of the standard which the nit have globally. so, don’t think there will be such the problem which will exist. being the institute of national importance like iit’s they are fully funded by central government. hope ur query is answered.",
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0367f0ca08012582b171d28df37d20f4 | what is menopause ? | askiitians.com | 2021.21 | [
{
"text": "menopause is the stoppage of menstruation in woman.",
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c28197c838f14a613edbd5f8d4f6aa57 | what is differences b/w speed and velocety? | askiitians.com | 2021.39 | [
{
"text": "kinematics is the branch of classical mechanics that describes the motion of points, bodies (objects) and systems of bodies (groups of objects) without consideration of the causes of motion. [ 1 ] [ 2 ] [ 3 ] the term is the english version of a.m. ampère ''s cinématique, [ 4 ] which he constructed from the greek κ?νημα , kinema (movement, motion), derived from κινε?ν , kinein (to move). [ 5 ] [ 6 ] the study of kinematics is often referred to as the geometry of motion. [ 7 ] (see analytical dynamics for more detail on usage). to describe motion, kinematics studies the trajectories of points, lines and other geometric objects and their differential properties such as velocity and acceleration. kinematics is used in astrophysics to describe the motion of celestial bodies and systems, and in mechanical engineering , robotics and biomechanics [ 8 ] to describe the motion of systems composed of joined parts (multi-link systems) such as an engine , a robotic arm or the skeleton of the human body. the study of kinematics can be abstracted into purely mathematical expressions. for instance, rotation can be represented by elements of the unit circle in the complex plane . other planar algebras are used to represent the shear mapping of classical motion in absolute time and space and to represent the lorentz transformations of relativistic space and time. by using time as a parameter in geometry, mathematicians have developed a science of kinematic geometry . the use of geometric transformations, also called rigid transformations , to describe the movement of components of a mechanical system simplifies the derivation of its equations of motion, and is central to dynamic analysis . kinematic analysis is the process of measuring the kinematic quantities used to describe motion. in engineering, for instance, kinematic analysis may be used to find the range of movement for a given mechanism , and, working in reverse, kinematic synthesis designs a mechanism for a desired range of motion. [ 9 ] in addition, kinematics applies algebraic geometry to the study of the mechanical advantage of a mechanical system , or mechanism .",
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"text": "in simple we say speed=total distance travelled/totat time taken\nand\nvelocity=shortest distance between initial and final position/total time taken to cover this distance",
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{
"text": "speed=total distance travelled/totat time taken velocity is the rate of change in displacement with respective. velocity=shortest distance between initial and final position/total time taken to cover this distance",
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{
"text": "speed = scalar (only magnitude) but velocity= vector (magnitude and direction) speed= distance /time but velocity = displacement/time",
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{
"text": "speed=distance/time while velocity= displacement/time. si unit of both are m/s speed is a scalar quantity while displacement is a vector quantity. velocity can be positive , zero, or negative while speed can be positive only.",
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{
"text": "speed is scalar as distance is scalar velocity is vector as displacement is vector qty approve if useful",
"name": "",
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},
{
"text": "speed is distance travelled per unit time whereas velocity is displacement per unit time. speed is scalar quantity while velocity is vector quantity.",
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},
{
"text": "speed =distance /time distance means the actual distance travelled by the body velocity = displacement/timedisplacement means the shortest distance travelled the body between initial and final position speed is a scalar quantity where as displacement and velocity both are vector so speec can only be positive where as displacement can be positive,zero or negative",
"name": "",
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},
{
"text": "speed=total distance covered/ total time taken..it is scalar quantity (only magnitude) velocity =distance between initial and final position /time..... it is vector quantity (magnitude and direction)",
"name": "",
"is_accepted": false
},
{
"text": "speed is a scalar quantity. a scalar quantity has only magnitude. velocity is a vector quantity. a vector quantity has both magnitude and direction. speed = distance / time taken. velocity = displacement / time taken. distance is a scalar quantity. displacement is a vector quantity.",
"name": "",
"is_accepted": false
},
{
"text": "speed is a scalar quantity. a scalar quantity has only magnitude.velocity is vector quantity means magnitude as well as direction.",
"name": "",
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{
"text": "speed",
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"text": "my friend speed is a scalar quantity (which has only magnitude)and velocity is a vector quantity(which has both magnitude and direction).you can understand it clearly if you see a example of both the quantities.",
"name": "",
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},
{
"text": "speed is the total distance travelled by a body in per unit time. velocity is the total displacement of a body from the initial position to the final position in per unit time. speed is a scalar quantity whereas velocity is a vector quantity.",
"name": "",
"is_accepted": false
},
{
"text": "speed = distance/time , velocity = displacement/time speed is a scaler quantity while velocity is a vector quantity. ex: if a boy travels a distance from home to playground (200m). here the displacement and distance both are same(200m). if the boy goes from home to playground and again returns home with constant acceleration then here the distance would be 400m but the displacement would be 0. [ by this we can say that speed and velocity depends on distance and displacement.]",
"name": "",
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},
{
"text": "speed is equal to distance divided by time and velocity is displacement divided by time speed scalar quantity and velocity is vector quantity speed has only magnitude but no direction but velocity of both magnitude and direction",
"name": "",
"is_accepted": false
},
{
"text": "the difference between speed and velocity is speed = distance / time and velocity =displacement / time",
"name": "",
"is_accepted": false
},
{
"text": "speed=dist./time vel.=disp./time ...................................................... ...................................................... ......................................................",
"name": "",
"is_accepted": false
},
{
"text": "speed gas no direction associated with it whereas velocity has direction associated with it. hence we can say that speed is a scalar quantity whereas velocity is a vector quantity.",
"name": "",
"is_accepted": false
},
{
"text": "speed is a scalar quantity speed=distance/time velocity is a vector quantity velocity=displacement/time",
"name": "",
"is_accepted": false
},
{
"text": "speed is the rate at which an object covers a distance. velocity not only determines the speed of the object in motion but also the direction of the object in motion.",
"name": "",
"is_accepted": false
},
{
"text": "speed is related to distance,where as velocity is related to displacement.that is speed depends on the path but velocity dont depend on the path choosen",
"name": "",
"is_accepted": false
},
{
"text": "speed is scalar while velocity is vector quantity. velocity has direction speed doesnt have thats the reason for why speed is always positive while velocity is negative also.",
"name": "",
"is_accepted": false
},
{
"text": "speed= distance/time............................................................... velocity= displacement/time….….….….….….….….….….….….….….….…....",
"name": "",
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}
] |
|
5d2e2a5cbf3c60cbac39765776c00e93 | do u think it would work if i drop and prepare for iit jee 2012 and please tell me which coaching institue is better fiitjee south delhi or kota? | askiitians.com | 2021.31 | [
{
"text": "it would depend on ur intelligence and talent. analyse it properly by taking different tests in which ur application skills are tested. if ur results are satisfactory, then u may try in 2012. if not go for aieee or cet or other exams that offer lots of seats(though not comparable to iits). coming to ur 2nd question, i recommend bansal classes, rather than fiitjee. the fiitjee has less percentage selection in classroom coaching than bansal classes. further, if u are so interested to get into iits that u are ready to attend coaching for 12 hours a day go to narayana. however i don't recommend it as it is going to be extremely strenuous.",
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{
"text": "well it depends on u that whether u want 2 prepare 4 iit-jee or not.....if u hav confidence in urself beleive in urself u can do nethng..... coming 2 ur 2nd question delhi has many gud institutes.....but as compare 2 delhi kota too hav so many gud institutions such as bansal classes,resonance,allen,vibeant ne many other.....it depends on u whether u wnt 2 do it frm kota or delhi....",
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cb2fc2fe2d89647d591956f6a26f47de | who proposed the first natural system of classification? ans: it’s given in one of the answers provided by askiitians , that bentham and hooker gave it but in your notes it’s given schimper and eichler … which is correct ???? i am confused.... | askiitians.com | 2021.25 | [
{
"text": "dear i t was bentham and hooker who proposed 1st natural classification system. i think that it is correct.",
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{
"text": "aipmt 2016 exam pattern helps the applicants to understand the outline of the paper well which facilitate to prepare and plan in advance. the pattern specifies the duration of the paper, number of questions, marks allotted per subject, syllabus etc.",
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589e27e6af8942370dd0802b9baaa2a1 | if sec (a+b) + sec(a-b)=2seca and cosb not equal to 1 , then show that cos0=+or-root under 2 multiplied by cosa/2 | askiitians.com | 2021.25 | [
{
"text": "dear student please attach the question's image or source so that it is clear what is to be proved is it cos (a/2) or ( cos a )/2 regards",
"name": "",
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] |
|
81c3e32f1533e112fc17a25ecb69442f | the sides of a triangle are 9 , 12 , 15 . find the area of triangle formed by its centroid , orthocentre $ incentre ? | askiitians.com | 2021.25 | [
{
"text": "dear mayank clearly the given traingle is right angel triangle so its ortho center lie at vertex of angel 90 degree centroid g = {(0+0+12)/3 , (0+9+0)/3} = (4,3) incenter i= { (ax1 + bx2 +cx3)/(a+b+c) , (ay1 +by2 +cy3)/(a+b+c)} =(3,3) vertex are knoen now you can easly find the area please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best. regards, askiitians experts badiuddin",
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2d7fedc3cee1abc055ba4e060fdb7153 | a train travels 360 km at a uniform speed. if the speed had been 5 km/h more, it would have taken 1 hour less for the same journey. find the speed of the train | askiitians.com | 2021.31 | [
{
"text": "dear student let the speed of the train bexkm/hr. time taken to cover 360 km = 360/x as per the question given, →(x+ 5)(360-1/x) = 360 →360 -x+ 1800-5/x = 360 →x(x+ 45) -40(x+ 45) = 0 →(x+ 45)(x- 40) = 0 →x= 40, -45 as we know, the value of speed cannot be negative. therefore, the speed of train is 40 km/h. thanks",
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620896af99ccd6e877b31e3f95fea189 | how much rank should i get in jee mains 2016 to get a seat in vnr vjiet through b category cse branch ? | askiitians.com | 2021.39 | [
{
"text": "it must be below 20000",
"name": "",
"is_accepted": false
},
{
"text": "dear friend, to get a seat at vnr vjiet one has to attain minimum19k to 20k, so you may visit the official website of the institution yourself as well and get to know the status of seats and branches there, if you got it there, well and good or else you may try getting admission at some other reputed inatitutions like – presidency university,bangalore,................lovely professional university, phagwara,..............bits, mesra etc.these all institutions are olrking diligently and painstakingly for the betterment of their students.",
"name": "",
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}
] |
|
d4bb8edb1f0b6d23e224db8c79f3ee2c | what is surrounding?? | askiitians.com | 2021.39 | [
{
"text": "the definition of surrounding refers to everything that is around a particular person, place or thing.",
"name": "",
"is_accepted": false
},
{
"text": "the definition of surrounding refers to everything that is around a particular person, place or thing.",
"name": "",
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] |
|
44250a14bda8a1e3ae4cf08fd0efcb7e | from which time the results of iit jee 2010 will be displayed today on 26th may 2010? pls tell me! | askiitians.com | 2021.25 | [
{
"text": "it is displayed …...............please check the result.......................................................................",
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|
ef9b8f3ec159840044fc0695e658e396 | i think to get 41 marks in jee mains and 375 marks in boards. my caste in obc. am i eligible for jee advanced this year 2016. | askiitians.com | 2021.43 | [
{
"text": "dear student, 1 is very less score. you may not clear the cutoff. thanks.",
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] |
|
f7bab168a1ebd4fbda289c2a3a1ba640 | a 60 hp slippering motor attached with 60 hp oil immmersed starter was properly running in good condition but suddenly it got damaged bt voltage fluctuation/surge in voltage. what are the techinacal reasons that both got damaged at one time due to voltage fluctuation/surge in voltage. please give detailed technical reasons. thanks sir,earlier i had already asked this question and got the reply,but the reply was that it was explaining working of slippering motor but my question was not answered. kindly read my question again and please reply for my question please reply fast,if possible within hour. akash | askiitians.com | 2021.31 | [
{
"text": "sensitivity to voltage levels and voltage fluctuation every piece of electrical equipment will operate within a range of voltage levels, however not necessarily with optimal performance. when the voltage level falls outside of its operational range, a device may be unable to start or operate, it may malfunction or the device may be damaged. the width of the voltage level range within which a device will operate is a measure of its sensitivity to voltage level. a device that will operate fairly well within a range of +/-10% of nominal voltage would be considered to have a relatively low sensitivity to voltage level or voltage fluctuations. a device that operates properly only when the voltage level is within +/-5% (or less) of nominal voltage would be considered to be sensitive to voltage level or fluctuations. three phase motors are very tolerant of voltage level fluctuations while the electronic controls for the same motor might be quite sensitive.",
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a39efdabc59e9dbbc8cd6f99b93a42b4 | which method should i use to do stochiometric calculations
mole method or equivalent method | askiitians.com | 2021.21 | [
{
"text": "both mole and equivalent method can be used for stochiometric calculations but equivalent method is prefered over mole method because in case equivalent method a balenced chemical reaction is not must but during use of mole method a balenced chemical reaction is must. thanks ®ards askiitians kamlesh kumar msc(c.s.j.m kanpur)",
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|
82ffbb1726422bb4be10d2dd871ad023 | does the magnetic field lie in the wave particle duality? | askiitians.com | 2021.21 | [
{
"text": "dear student please attach the image of the question regards",
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}
] |
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e44256529c5aca9746700ce3135d4447 | whethre it is too differ ? or which is better ? or whether productn can be an option to mech? plz repl me :-( | askiitians.com | 2021.39 | [
{
"text": "dear nikhil, mechanical is a better branch. cracking iit just got more exciting,it s not just all about getting assistance from iitians, alongside target achievement and rewards play an important role. askiitians has it all for you, wherein you get assistance only from iitians for your preparation and win by answering queries in the discussion forums. reward points 5 + 15 for all those who upload their pic and download the askiitians toolbar, just a simple to download the toolbar…. so start the brain storming…. become a leader with elite expert league askiitians thanks aman bansal askiitian expert",
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|
f0b8693ff19b8c53e739701eb7c1c1a3 | what is e 1 — c b mechanism?? plz help | askiitians.com | 2021.43 | [
{
"text": "it is a kind of elimination reaction . reaction occur through conjugate base held with bad leaving group i.e. stronger bases. it is a two step process in step one strong base attacks on beta hydrogen from back side and carbanion is formed( conjugate base) in step 2 as a result of self stabilization leaving group departs and an allene is formed",
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bbd325d43d2f33b0c5f0b0943f147dca | evaluat the integration of x 3 sin3x limit 0 to pie by 2 | askiitians.com | 2021.25 | [
{
"text": "dear ajay let first function is x 3 and second function is sin 3x now integrate it until x^3 vanishes. you will surely get your answer. please don’t afraid of steps regards arun (askiitians forum expert)",
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8ef10104189d70787967ceb996b3cc9d | solve lim(x->inf) [x 2 +x+1/2x 2 +x+1] sinx/x | askiitians.com | 2021.43 | [
{
"text": "ans: hello student, please find answer to your question below",
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] |
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565501ae6324df1098fc10133ee4d742 | if teta is the angle between the asymptotes of hyperbola x2/a2-y2/b2 = 1with eccentricity e, then sec teta/ 2=?? ( e,e/2,e/3,e/(e2-1)1/2) | askiitians.com | 2021.25 | [
{
"text": "dear student please write the question in a standard form or attach an image of the question regards",
"name": "",
"is_accepted": false
}
] |
|
bf9e2eb225a5f82f3089a177fe08b36c | if vector a and vector b are two non zero vectors such that a bar +b bar =a bar -b bar/2 and a bar =2 b bar then the angle between a bar and b bar is: | askiitians.com | 2021.31 | [
{
"text": "let the angle between the two vectors be x° a vector+b vector =a vector - b vector/2therefore, by vector lawsa vector + b vector=√a×a + b×b + 2abcosx &a vector - b vector/2 = √ a×a +b/2×b/2-2ab/2cosxtherefore, squaring both sides a×a + b×b + 2abcosx=a×a + b×b/4 - abcosx3/4b×b=abcosxb=4/3acosx put b= 4/3acosxtherefore,3/4×16/9cosx × cos x =a×4/3a cos x4/3 a×a cos x × cos x =4/3a×a b cos xcos x = 1x=0°therefore, the angle between the two vectors is 0°.",
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|
92290f4222cdf2e617ef904f45a1257e | can you provide me with past five year papers of imo (international maths olympiad) as soon as possible? (class 9) | askiitians.com | 2021.25 | [
{
"text": "dear jatin you can check fiitjee website for the same. as there is no option to shre pdf over here hope it helps regards arun",
"name": "",
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},
{
"text": "dear student it is against forum policy to give link here. you can open fiitjee website and in olympiad section you can get the same",
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|
bf46fdd058534c7c994d21285d5e3729 | rankwise college allotment of iit for sc category. | askiitians.com | 2021.25 | [
{
"text": "dear hemant and as compared to the last year's cutoff this year this has been predited that the cutoffs will be lowered, as the difficulty level of the paper is slightly increased however score may vary and as a result rank may also vary, a slight difference may create lots of difference in rank. for further details you can visit the following: http://www.askiitians.com/iit-jee-2010-cut-offs.aspx h ttp://www.askiitians.com/iits-2009-2010-opening-and-closing-rank.aspx please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best. regards, askiitians experts badiuddin",
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|
0c18560eb3fb86b9e481855b9800c16f | find molecular mass of a gas of the specific heats of the gas are cp=0.2 and cv=0.15. | askiitians.com | 2021.25 | [
{
"text": "dear naman as we know. cp – cv = n* r 0.2 – 0.15 = n * 0.0821 0.05/0.0821 = n n = 0.61 moles regards arun (askiitiams forum expert)",
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|
1243075b67dfb1a16d77d0a11964718a | has any specific weightage been given to organic chemistry in the iit-jee paper?? | askiitians.com | 2021.31 | [
{
"text": "dear yogen there is no specific weightage given to any topic in iit jee. weightage vary every year. all the best. akash goyal askiitiansexpert-iitd please feel free to post as many doubts on our discussion forum as you can. we are all iitians and here to help you in your iit jee preparation. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar..",
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|
eb3093f24ce37e9649b1be500a51af83 | q.two circles of radii r1 and r2(r1>r2) touch each other both of them externally.then what is the radius of the circle which touches both of them externally and also their direct common tangents. | askiitians.com | 2021.21 | [
{
"text": "the figure will be like three balls kept on a table( commen tangent) with the smallest circle between the two circles of radius r1 and r2. sorry i cant upload the image . the solution is the main idea is to find the distance b/w the foot of perpendiculars from the center of the two given circles to the common tangent by two ways and then equating the two equations obtained to get the value of radius. 1st equation form a right triangle by taking the distance b/w the centers of the circles as hipotenuse and solve for the base using pythagores th. 2nd equation form right angled triangles (2) by joining the centre of the required circle with the centres of the two given circles and solve for the base and then sum up the two distances and then equate it with the distance obtainesd in the first equation r = r1+r2/( sq. root r1+ sq. root r2)square hope you find it usefull atbsya (all the best see you again)",
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|
3c78eb3da7092a3574bed4df49f516f2 | if a,b,c be the unit vector such that b is not parallel to c and a×(2b×c)=b then angel that a make with b and c respectively is ? | askiitians.com | 2021.31 | [
{
"text": "the equation becomes: 2[( a.c ) b – ( a.b ) c ]= b b [2( a.c ) – 1]= ( a.b ) c so, a.b= 0 and 2( a.c ) – 1=0 or cos θ=1/2=cos60 so, angle between a and b is 90 degree and angle between a and c is 60 degree",
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] |
|
45d77390a1b0108be2380e9e99b8cb14 | top engineering college in india | askiitians.com | 2021.21 | [
{
"text": "the top rank goes tothe iit’s. then comes bits and nit’s. then comes regional engeneering colleges.(vit also)",
"name": "",
"is_accepted": false
},
{
"text": "there are numerous engineering colleges like iit, nit, dtu, bits, skiet and many others which are well established and recognized for their best academic facilities and highly qualified experienced faculties.",
"name": "",
"is_accepted": false
},
{
"text": "hi buddy, apart from the above suggested college i think you should check university of petroeum and energy studies, dehradon too. i’ve heard a lot about this university and am constantly following its official fb updates. i really liked their program specialisations, they are innovative and seems promising too. they have very good placement records and lots of events, seminars, industrial visits updates also being shared on their page. i’ve heard very good reviews on web too. the last date to apply for its entrance exam is 3 rd may, so you’ve lots of time to inquire about it.",
"name": "",
"is_accepted": false
},
{
"text": "the best colleges are iits, niits, iiits, bit, vit and some deemed universities. after all it depends upon the goal one is pursuing as every college doesn’t provide the best in every aspect",
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}
] |
|
a86d0ef5fd51db1698de0528d485dba5 | hey my rank is 16263.... cn i seek admsn in colgs of extended list?? | askiitians.com | 2021.25 | [
{
"text": "it is next to impossible. try in for some other college--maybe some nit or dce or bits.",
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"is_accepted": false
}
] |
|
d323b74364fd05ef9f8bb74ae0d2c60f | when the door of a fridge is kept open for a long time, does it reduce the temperature in the room? if yes, by what fraction and if no, why? | askiitians.com | 2021.21 | [
{
"text": "we can't find the fraction but yeah it does reduce because of transfer oh heat form the room to refgerator",
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] |
|
70e9de0aa7134c3cc8665fa16c649021 | plz i know i am giving u trouble again but this is for confirmation, should i buy my son rd sharma or mtg foundation books for maths from 8th to 10th. which us better plz answer sir. which one u consider better and why ? plz answer more clearly, concise even a long answer is okay but can u tell me a fixed answer which one should i buy ? plz plz plz | askiitians.com | 2021.39 | [
{
"text": "dear parents rd sharma is beeter because it has wverything in deep which clears concepts from basics. also rd sharma focus more towards competition. i prefer rd sharma more. hope it helps",
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] |
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415c7b16b7511fc87c5e1de2972f1df9 | textile engg at iit-d or automation engg at nsit or instrumenation at nsit.wich is better plz reply | askiitians.com | 2021.25 | [
{
"text": "dear javed, iit is best .. but sud go with best branch.. hope u get the best. please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. all the best. regards amit - it bhu now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian.",
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ce9bde84da0ee9b0f81f13fe1c50520f | select the correct option regarding mab. it strands for mammals and biosphere man and biology programme man and biosphere programme mammals and biology programme | askiitians.com | 2021.25 | [
{
"text": "hello student correct answer is 3. man and biosphere programme. man and biosphere ( mab ) is an international biological programme of unesco which was started in 1971 but introduced in india in 1986.",
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] |
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3c0dce0f74fb1b6242ba13b08e1e57fc | what is modular programming?? | askiitians.com | 2021.31 | [
{
"text": "modular programming can be used to break up a large program into manageable units, or to create code that can be easily re-used. a modular program consists of a main module and one or more auxiliary modules. each module originates from a separate source code file. the main module is compiled as an exe, and calls functions in the auxiliary modules. the auxiliary modules can be dynamically linked, meaning they exist as separate executable files (dlls) which are loaded when the main exe is run; or they can be statically linked, meaning they are compiled as object files or static libraries (libs) that are combined with the main module into a single executable file. once you have learned how to create an executable file from an xbasic source program, it is easy to extend the procedure to make dynamically linked modules and (a little less easily) statically linked modules. there are, however, a few rules that must be followed when writing the source code for the auxiliary modules. each module must have a unique name, assigned in the program statement. this name must be the same as the file name of the source code, minus the .x extension. for example, the source code auxiliary.x must have the statement program \"auxiliary\" in the prolog. (the standard prolog code contains the comment that the program name must have 1 to 8 characters, but names longer than this seem to work without any problem. however, the name cannot contain spaces.) function names need to be unique across all modules (with the exception of internal functions). this includes the entry() function, which will need to be renamed in each auxiliary module. after re-naming the entry() function, be sure to edit the prolog so that the new name is the first declared function. see below for more notes on the entry function. all functions, composite types, and global constants that will be used by the main module (or by another auxiliary module) must be exported - ie., enclosed in an export...end export block in the prolog. external variables can be used in statically linked modules, but not in dlls. such variables are shared only within a single executable module, and since all statically linked modules are combined with the main module into a single exe, external variables can be shared between them. a dll remains separate from other modules, and does not share external variables with them.",
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efd1bb73b88f1e83c04707ef554c18f3 | which flightless bird do not have sternum with keel ? | askiitians.com | 2021.31 | [
{
"text": "dear student ratites do not possess this keel, and its absence is one reason why the group’s muscles are unsuitable for flight.",
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|
c042769d428e80140b0278b9843236d6 | hydrogen is a group seven element or group one element?....since it contains the properties of group one and seven | askiitians.com | 2021.31 | [
{
"text": "hey there ! position of an element in periodic table depends upon its electronic configuration and properties. hydrogen resembles the elements of group i-a, iv-a and vii-a in some respects. properties of hydrogen do not completely match any one of the above-mentioned groups. that is why position of hydrogen is still undecided, but because of the study purpose and maintaing regularity it is placed seperately above group 1 elements and not with group 1 elements .. hope it helps",
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{
"text": "answer :: hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. however, it varies greatly from the alkali metals as it forms cations (h+) more reluctantly than the other alkali metals. *it resembles halogens in forming diatomic molecules. it does not behave like halogens, being mainly in the +1 oxidation state. * it does not happen to be like halogens, (the most stable compounds of halogens have either -1 or a very high oxidation state like -7 or +5). thanks",
"name": "",
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{
"text": "hydrogen shows properties of both group 1 and group 17. here are some properties of hydrogen. resemblance with alkali metals:- electronic configuration: hydrogen like alkali metals has one electron in it's valence shell. electropositive character: hydrogen like alkali metals is electropositive because it can lose one electron readily to form hydrogen ion (h+). valency and oxidation state: like alkali metals hydrogen also shows an oxidation state of +1 in it's compounds. combination with electronegative elements: like alkali metals, hydrogen forms binary compounds with electronegative elements such as halogens, oxygen, and sulfur. liberation at cathode: when the fused salts of alkali metals are electrolysed, metal ions are liberated at the cathode. in a similar manner, hydrogen is liberated at the cathode on subjecting the aqueous solutions of it's salts to electrolysis. reducing agent: like alkali metals, hydrogen acts as a strong reducing agent. resemblance with halogens:- electronic configuration: like halogens hydrogen has only one electron less than the nearest noble gas configuration. ionisation enthalpy: the ionisation enthalpy of hydrogen is quite close to that of halogens. electronegative character: hydrogen like halogens had tendency to accept electron to form monovalent anion. by accepting an electron hydrogen as well as halogens acquire noble gas configuration. oxidation state: like halogens hydrogen exhibits oxidation state of -1 in it's compounds. diatomic nature: hydrogen molecule (h2) is diatomic like halogens molecules (f2,cl2,br2,i2). liberation at anode: when fused with alkali metal hydrides such as lithium or sodium hydride is electrolysed hydrogen is liberated at the anode. this is in the same way as halogens are liberated at anode when fused with alkali metal halides are electrolysed. non-metallic character: like halogens hydrogen is non-metallic in nature. nature of compound: like halogens hydrogen combined with non-metals such as carbon, silicon, germanium, etc. to form covalent compunds.",
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eb983c03c8096db266154906c5f0b0e1 | please answer 4th question and give solution to................................... | askiitians.com | 2021.39 | [
{
"text": "4 th question is not there in this image. kindly do upload the correct image.",
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}
] |
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f4f346a0dee31c467d8825c625de7031 | what is loop of henle and what is its function? | askiitians.com | 2021.25 | [
{
"text": "in the kidney the loop of henley is the portion of a nephron that leads from the proximal convoluted tubule to the distal convoluted tubule. the loop of henley is located in nephron, the functional unit of a kidney. it’s function is to reabsorb water and important nutrients in the filterate. the descending limb of the loop is permeable to water but not nutrients, while the ascending limbs is permeable to nutrients but not water.thus in the descending limb water is reabsorbed by osmosis.in the ascending limbs, water can not pass through thw membrane whilesolutes are actively and passivelytransported through it. thanks & regards rinkoo gupta askiitians faculty",
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2f40ab87e664221fa62885f8d521dae7 | usually covalent radii of atoms increase or decrease down the group?explain why covalent radii of aluminium and gallium are equal? | askiitians.com | 2021.43 | [
{
"text": "radii whatever it is of type would tend to increase down the group generally. as the number of shells in the elements increases steadily. and for al and ga the radii seems equal or similar due to the lanthanide contraction. this is the foremost and only the main reason.",
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|
6529ea6ef6c55445434e64125cd44bdb | what abt the colleges in extended merit list???? what options do i have??? i m in eml | askiitians.com | 2021.25 | [
{
"text": "what abt the colleges in extended merit list???? what options do i have??? i m in emlwhere see the emi list",
"name": "",
"is_accepted": false
},
{
"text": "it is the list of candidates drawn up with some further relaxation in the aggregate cut-off beyond the cut-off of the jee-2008 common merit list. these eml candidates have not qualified in jee-2008 and thus are not eligible for admissions to iits, it-bhu, and ismu. use of eml – some of the mhrd/other government of india institutions uses the extended merit list of jee for admissions to their institutions. all the candidates who are declared qualified in the extended merit list should lookout for the advertisement and apply to the following institutes directly for admission or for further details. list of institutions using eml •indian institute of space science and technology, bangalore •indian institutes of science education and research(iiser) mohali, chandigarh •indian institutes of science education and research(iiser) , pune •indian institutes of science education and research(iiser) , kolkata •indian institutes of science education and research(iiser) , bhopal •indian institutes of science education and research(iiser), thiruvananthapuram •rajiv gandhi institute of petroleum technology society (rgpit), noida, (u.p.) •indian institute of maritime studies (merchant navi), mumbai only few of u can get the chance to admission ....................best of luck",
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] |
|
2c8a3eab12a7cb32a5f0d2fc98009295 | sir what will do if i had a doubt and i want the solution immediatily through this site? | askiitians.com | 2021.21 | [
{
"text": "there are options available for you being a paid user for that purpose, where your doubt will be put on a fast-track mode and the priority will be given to your doubt. hence, any expert on this side will tackle your doubt first.",
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|
4e219519363a1320a245dd0788aabddf | two equal charges of magnitude q each are placed at a distance d apart.their electrostatic energy is e.a third charge-q/2 is brought midway between these two charges.the electrostatic energy of this system is now | askiitians.com | 2021.21 | [
{
"text": "here the energy refers to the electrostatic potential energy does initially there have a potential energy of k q bhai d then when charge is brought final potential energy after system will change to 5 e finally pe = kq÷(d÷2) +kq÷(d÷2) +e. and e= kq÷d",
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}
] |
|
7560d4cb1cdd3c06f7fcc50f88911fd5 | (2cos40 o - cos20 0 ) / sin20 0 can you help me ,what is the result | askiitians.com | 2021.43 | [
{
"text": "2*cos40 - cos20 = cos40 + (cos40 - cos20) = cos40 - 2*sin((40+20)/2)*sin((40-20)/2) = cos40 - 2*sin30*sin10 = sin(90-40) - sin10 = sin50 - sin10 = 2*sin((50-10)/2)*cos((50+10)/2)=2*sin20*√3/2=√3*sin20 √3*sin20 / sin20 = √3",
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"is_accepted": false
}
] |
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3a0ef2dc6304e6b9e27192dee35c1aa2 | two objects of mass m connected by a ligft rigid rod are place on a smooth horizontal surface.an impulse j=mv is applied to one of the objects perpendicular to the rod.calculate the angular accleration of the system just after the impact | askiitians.com | 2021.43 | [
{
"text": "dear student, angular momentum impulse given = mv(l/2) = i system w mv(l/2) = (2ml 2 /4) w angular velocity just after the impact = w = 2v/l thanks",
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}
] |
|
fc79c9ed1859cefb9da2d7d5e36dec80 | explain the difference in the nature of bonding in lif and lil | askiitians.com | 2021.25 | [
{
"text": "en difference between li and f is more than the difference between li and i , uni positive li has more polarising power on large size i rather than f, so lif is ionic and lii is more covalent.",
"name": "",
"is_accepted": false
}
] |
|
e355f26346ee970edc95929795fa1ce9 | b-b bond length how much? | askiitians.com | 2021.39 | [
{
"text": "1.77 angstam",
"name": "",
"is_accepted": false
},
{
"text": "1.77 a 0",
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"is_accepted": false
}
] |
|
2fd4149c556a835bf7d5d44b59654b0d | explain why the planets do not twinkle. explain why the planets do not twinkle. | askiitians.com | 2021.21 | [
{
"text": "dear student planets are much closer to earth and behave like extended source. thanks",
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}
] |
|
c7572847915e57a228a7c54b287cd232 | explain how cloning was done to produce dolly. | askiitians.com | 2021.21 | [
{
"text": "in cloning, egg from sheep ‘a’ with taken and its nucleus was replaced with a nucleus from body cell of sheep ‘b’. the cell thus produced was implanted in the womb of sheep a where it developes into a normal baby sheep. the baby sheep thus bom was found to be exactly similar to-sheep ‘b’ whose nucleus was taken. thus, dolly was bom on 5th july 1996.",
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] |
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a83ad1c7464685463ecc2d53ca47324d | an inductor 2/π h, a capacitor 100/π uf and a resistor 75ohm are connected to ac supply of v=10sin100πt .find energy dissipated in circuit in 20 minutes. ..... ans: 288j(may be incorrect) | askiitians.com | 2021.25 | [
{
"text": "l=2/ pi h. c=100/pi x 10 -6 f r=75 ohm x l = ωl = 100 π x 2/π = 200 ohm x c = 1/ ωc = 1/ 100 π•100/π x 10 -6 = 100 ohm z = 125 ohm. (to be calculated) p = v rms i rms cos∂ = ( v rms) 2 r \\_\\_\\_\\_\\_\\_\\_\\_ z 2 = 6/25 w energy = pt = 6/25 x 1200 s = 288 j",
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a5872eca372d9c11512fe1eea88cb4f4 | sir, i have got an air 3334 in aieee 2011. i am doing be mechanical engg. from bit mesra (first year). if i get dce cse/ece/mech. or iiit-h cse should i go? | askiitians.com | 2021.21 | [
{
"text": "dear aakash, bit mesra is a good college and it has good placements and facilities. if you are happy with mechanical then you must not change but if you feel ece to be more intereresting then you must change to dce(now dtu). best of luck plz approve the answer...!!!! cracking iit just got more exciting,it’s not just all about getting assistance from iitians, alongside target achievement and rewards play an important role. askiitians has it all for you, wherein you get assistance only from iitians for your preparation and win exciting gifts by answering queries in the discussion forums. reward points 5 + 15 for all those who upload their pic and download the askiitians toolbar, just a simple click here to download the toolbar…. so start the brain storming…. become a leader with elite expert league askiitians thanks aman bansal askiitian expert",
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|
6ccf02835c3edf8f9a5a397bf52ba1d9 | hello dear, i need urgent solution... i m doing mba from distance and there is no catology thats why selecting rendemly... regards, uday 8435002994 | askiitians.com | 2021.43 | [
{
"text": "how could we process this!",
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}
] |
|
e911bad501cfc7ec38c12b3fcfcfab81 | what is k in bisector of the angle between two vectors (as given in ur study material)??? | askiitians.com | 2021.31 | [
{
"text": "when two vector amplitides are given at some phase difference, then resultant of these can be find out using resultant equation, in which the phase angle is the phase difference between that is a function of propagation constant and path difference. so that ‘k’ can be wave propagation constant.. good luck..................................................",
"name": "",
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}
] |
|
3ee35906fe2949797c9799e3abd96d2b | give the names of the elements present in the following compounds: (d) potassium sulphate. | askiitians.com | 2021.43 | [
{
"text": "dear student potassium sulphate elements → potassium, sulphur and oxygen thanks",
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"is_accepted": false
}
] |
|
e926938240a59dead0e245d721e8b2f8 | how do poriferan animals differ from coelenterate animals? | askiitians.com | 2021.25 | [
{
"text": "dear student animals from porifera show cellular level of organisation, while those from coelenterata show tissue level of organisation. # in porifera there is no division of labour, while in coelenterata some division of labour is seen. # porifera do not have coelom, while coelenterata have coelom. thanks",
"name": "",
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] |
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556ee38694259d77a6a60ab35367f733 | in an exam there are papers of four different subjects three of them have 50 maximum marks 4th paper has maximum marks 100. find no of ways of scoring exactly 60% marks | askiitians.com | 2021.21 | [
{
"text": "dear piyush, concept : for questions involving distribution of objects (here marks) into groups (here it is 4), we use the binomial co-efficinet method. you should be aware that co-efficient of x^r in (1-x)^(-n) = (n+r-1)c(r) {that is the approach we would be taking} here we let marks in 1st subject be x1, in 2nd be x2, in 3rd be x3 and 4th be x4. the constraint is clearly, x1, x2, x3 lies in the interval [0,50] and x4 lies in the interval [0,100]. with x1 + x2 + x3 + x4 = 150 (which is 60% of the total 250 marks) now we need co-efficent of x^150 in ({ 1 + x + x^2 + x^3 + ....... + x^50 }^3)*( 1 + x + x^2 +...... + x^100 ) ie we need co-eff of x^150 in {(1-x^51)^3}*(1-x^101)*{(1-x)^(-4)} ie we need co-eff of x^150 in { 1 - 3x^51 + 3x^102 - x^153 }*(1-x^101)*{(1-x)^(-4)} ie we need co-eff of x^150 in [ 1 - x^101 - 3*x^51 + 3*x^102 ]*{(1-x)^(-4)} ----------- (note that we have multiplied the terms in the first two brackets and have retained only those terms whose power is less than 150. other terms with power of x greater than 150, would not contribute to the coeff of x^150) so the req co-eff is: (let us say that {(1-x)^(-4)} = z} (co-eff of x^150 in z) - (co-eff of x^49 in z) - 3*(co-eff of x^99 in z) + 3*(co-eff of x^48 in z) ------ (this is obtained say for example, in the second term co-eff of x^150 in x^101*z, would be co-eff of x^49 in z) this would be evaluated using the co-eff of x^r in (1-x)^(-n)...... as mentioned in the beginning. so the required ans would be: [ 153(c)150 - 52(c)49 - 3*102(c)99 + 3*51(c)48 ]...... which you need to evaluate....... hope that helps!!! regards, ashwin (iit madras).",
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|
7bf804317ebd0d59ca83ae8760ad5290 | in the wave picture of light, intensity of light is determined by the square of the amplitude of the wave. what determines the intensity of light in the photon picture of light. | askiitians.com | 2021.43 | [
{
"text": "in the wave picture of light, the intensity of light at a pt. is determined by the no. of photons incident per unit area around that point.",
"name": "",
"is_accepted": false
},
{
"text": "intensity of a wave(carrier of energy) is defined as the energy crossing per unit area per second(power/area). intensity of a particle(photon,quantum of energy) is defined the flux of no. of particles per second(means no. of photons passing per area per time). so in the photon picture of light if no. of photons increases then intensity of light increases. albert einstein used this concept to describe photo-electric effect. he proposed that a photon collides with a single electron and transfers its all energy to the electron and electron leaves the metal surface. so if intensity of light is increased then more photon will incident on the surface and so more electrons will emerge.",
"name": "",
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] |
|
c5a9225e744304bcd73dd90dbb6b968e | sir i am expecting 133 marks in jee adv 2014 & got 149 marks in jee mains ,what should i expect. | askiitians.com | 2021.43 | [
{
"text": "your predicted jee advanced 2014 rank is between 13401 and 13500. you may not get a seat in iits this year. but you have decent marks in jee main, so you may definately get any nit. all the best. thanks bharat bajaj iit delhi askiitians faculty",
"name": "",
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] |
|
1e41ecc954bb1f4f23c7bc1994112514 | if z = x+ iy where x,y€r then show that |x| + |y| | askiitians.com | 2021.21 | [
{
"text": "dear student, the question is here incomplete. pls do check the qstn. and repost it again for the proper clarification. cheers!! regards, vikas (b. tech. 4 th year thapar university)",
"name": "",
"is_accepted": false
}
] |
|
af103735a3d04ba9237bd926f38d4d19 | which of the following is correct order of size ? (a) i+ > i > i– (b) i– > i > i+ (c) i > i+ > i– (d) i > i– > i+ | askiitians.com | 2021.31 | [
{
"text": "answer: b",
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}
] |
|
3163afecbd5f5ba4c6fd11f86be60038 | let a,b,c be real numbers such that a+2b+c=4. find max (ab+bc+ca) | askiitians.com | 2021.43 | [
{
"text": "attaching the solution thanks & regards sudhir, askiitians faculty qualification. iit delhi",
"name": "",
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}
] |
|
91460b20a8baca6a5ca97ee63e4e8a0c | a block slides down an incline of angle 30o with an acceleration of g/4. find the kinetic friction coefficient | askiitians.com | 2021.39 | [
{
"text": "let u be the coefficient of kinetic friction. (netforce)mg/4=mgsin@-umgcos@ by solving we get sin@-ucos@=1/4 by substituting @=30 we get u=2/root of 3 please approve if you feel the answer is correct",
"name": "",
"is_accepted": false
},
{
"text": "answer should be u=1/2root3 because mg(sin@-ucos@)=mg/4sin 30 - ucos 30=1/41/2-uroot3/2=1/4u = 1/2root3",
"name": "",
"is_accepted": false
},
{
"text": "given :inclination angle=θ=30 degreesa=g/4 m/s²coefficient of kinetic friction .total net force= mg/4=mgsinθ-μmgcosθwhere μ is coefficient of kinetic friction.mg/4=mg[sinθ-μcosθ][sinθ-μcosθ] =1/4substituting the inclination angle, we getsin30- μcos30=1/41/2-μ√3/2=1/41/2-1/4=μ√3/22-1/4=μ√3/21/4=μ√3/2μ=1/√3/2",
"name": "",
"is_accepted": false
}
] |
|
d641315268356ea6fb5d7cda27a8636b | a body falling from rest covers distances s1 and s2 in first and second seconds respectively. calculate the ratio s1/s2. plz help me out. thanks in advance. | askiitians.com | 2021.25 | [
{
"text": "dear jayati refer the pic for the solution all the best. akash goyal askiitiansexpert-iitd please feel free to post as many doubts on our discussion forum as you can. we are all iitians and here to help you in your iit jee preparation. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar..",
"name": "",
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{
"text": "body is falling from rest so its initial velocity = u=0 accleration due to gravity = g distance covered in first second = ut + at 2 /2 (u=0) s 1 =gt 2 /2=g/2 .......1 (t=1 , a=g) distance covered from t=0 to t=2 sec is =ut+at 2 /2=at 2 /2 (u=0) =2g (t=2) distance covered in second second = s 2 = 2g - g/2=3g/2 ..................2 divide 1 & 2 s 1 /s 2 = 1/3 ans",
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"is_accepted": false
}
] |
|
7c6323d982d902ae705c6beb7e816b91 | a 4m rod ab slides down the plane with v a = 4 m/s to the left and a a = 5 m/s 2 to the right. angle θ at this moment is 30 o . determine the angular velocity and angular acceleration at this instant of time. | askiitians.com | 2021.31 | [
{
"text": "angular velocity of ab =( v a -v b )/l ab = (4 cos60 - 0)/4 = 2/4 = 0.5 insatantaneous centre of rotation is point b since it has zero velocity. let the angular acceleration be therefore a a = (ab) = 5 cos60/4 = 5/8",
"name": "",
"is_accepted": false
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] |
|
fae706b20bf98a7250fb6653a989788b | a 20 μf capacitor is joined to a battery of emf 6.0 v through a resistance of 100 ω. find the charge on the capacitor 2.0 ms after the connections are made. | askiitians.com | 2021.21 | [
{
"text": "sol. c = 20 * 10^–6 f, e = 6 v, r = 100 ω t = 2 * 10^–3 sec q = ec (1 – e^–t/rc) = 6 * 20 * 10^-6 (1 – e^-2*10^-3/100*20*10^-6) = 12 x 10^–5 (1 – e^–1) = 7.12 * 0.63 * 10^–5 = 7.56 * 10^–5 = 75.6 * 10^–6 = 76 μc.",
"name": "",
"is_accepted": false
}
] |
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