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We know function and its inverse are mirror image about the line y=x and also that their composition is identity function (y=x again) So I was wondering if there is a link? I tried to look up for graphical interpretation of composition of functions but I couldn't fund any. | 1 |
According to Wikipedia: In the form of a screw jack it is commonly used to lift moderately heavy weights, such as vehicles. More commonly it is used as an adjustable support for heavy loads, such as the foundations of houses, or large vehicles. These can support a heavy load, but not lift it. Insights into its mechanism is greatly appreciated . | 1 |
Consider the task of extracting a cylindrical rod held by friction in a tightly fitting shaft. Instinctively one would tend to twist the rod around its axis while pulling. The question is, what is the physical basis for this? Does applying a torque reduce the axial force required? | 1 |
I received an email suggesting that we do something: "next week, when we would have been" doing something else. Would you call this an example of future subjunctive? If not, then what? Perhaps it's a present perfect subjunctive? I have been searching for an answer and have found few sites with any reference to a counterfactual statement set in the future. | 1 |
Let us say I have a single (converging lens) could I use the Abbe diffraction limit (for a microscope) to find its resolution or do I have to use the Rayleigh criterion. (i.e. Is the Abbe diffraction limit strictly for a microscope with more then one lens, or can it be used with only one lens?) | 1 |
I want to make a cardboard lamp, but i want it to look like half a sphere. Given a cardboard thickness of x, and a circle width of y, how many elements do I need and what radius do the elements need to be? Anyone got a formula for that? thanks alot! | 1 |
I'm looking for a synonym for the word "time card" or "clock card". I try to find a word for a card with which you can track your work times on a certain device your employe installs for its workers. I used the expression clock card but a native friend from uk said it is not a common expression. Can u help me? | 1 |
What I wrote is: "However, just as any other data carrier, images not only contain important data, but also such of lesser significance to us. " I want to say that images not only contain important data, but they also contain data of lesser significance. How can I write it without repeating "contain" and make the whole sentence sound more natural? | 1 |
The majority of definitions give the same meaning - "Pandora's box" is a synonym for "a source of extensive but unforeseen troubles or problems." Are there any other metaphors or phrases with the same meaning? | 1 |
A book divided in several chapters/topics, can also be considered to be divided in categories (or have categories)? Not sure if category can be used in this case, or if it should only be used in the context of category theory. | 1 |
I need a very much physical explanation for the phenomenon of Resonance associated with forced oscillations (damped). I have gone through HRW and Concepts of Physics by H C Verma, but that wasn't of much use for me. I got some mathematical idea of the thing, but still I'm not confident. | 1 |
If tidal power plants are slowing down Earth's rotation then is it theoretically possible to build a power plant that would drain energy from Earth's angular momentum (thus slowing down it's rotation)? What would such machine look like? | 1 |
What's the word for the condition in which you have a unusually high body temperature after being exposed to harmful winds without proper clothing protection? It's as if the winds somehow got through your pores and made you sick. | 1 |
When I spin a penny, I spin it on its "edge" (circumference). So why is it that when the penny inevitably stops spinning, it never comes to rest on its edge, instead falling onto one of its faces? It is not a problem with the "thinness" of the penny; its possible to balance a penny on its edge in a couple of seconds. | 1 |
So I was writing a lab report for Physics I, where I was describing projectile motion. I had written Since gravity on Earth does not have a horizontal force, the object will not lose horizontal velocity (velocity in the x direction). Then this made me think, is there any gravitational force found in nature that has both vertical and horizontal components? | 1 |
Could someone provide me with a mathematical proof of why, a system with an absolute negative Kelvin temperature (such that of a spin system) is hotter than any system with a positive temperature (in the sense that if a negative-temperature system and a positive-temperature system come in contact, heat will flow from the negative- to the positive-temperature system). | 1 |
It is known that there are no diproton or dineutron nuclei. Does this mean that two protons or neutrons are not actually attracted to each other? Even if the attraction was weak, wouldn't it cause bound states anyway? Related: What do we know about the interactions between the protons and neutrons in a nucleus? | 1 |
I have recently heard the term "Acme developer of IPhone." I was just wondering what it stands for? I think I know the meaning: Is it when a developer goes to a client and presents his/her ideas for the app? | 1 |
Anthony Martin, assistant accountant, PwC, and associate editor, Washington Post. The commas above look a little too much. Are they technically all correct? Which would you recommend removed? I was thinking of removing the one before "and" since it looks the most clunky, but feel that comma is necessary here. | 1 |
Like charges repel. What keeps an electron's charge from repelling itself? This problem would come up if an electron was divisible and its parts had fractional charge. A related question is, what keeps an electron from being divisible? | 1 |
I got that words from novel. I've been looking for the meaning but still can't get what it means. Is that kind of slang? "Hi, Mr.Tushman! I see you're running a little behind today! Did your car get rear-ended again? What a bum rap!" | 1 |
I have gps trackings that I know they fall into a certain pattern - a line with a known angle. How do I find the line that minimizes the distances of the points from it but is in the correct angle? Unfortunately, I can't post an image for example. | 1 |
I have a question about the following: Texas is only one of the states that still have sizable wheat production. Texas is the only one of states that still has sizable wheat production. I want to know whether the above construction is true. If so, what is the rule? | 1 |
Can guilty be used as a noun? For example, as in the title of Chase's novel: The guilty are afraid. Is it that people or folks is understood after guilty and in effect an ellipsis? I do not find guilty marked as a noun in Webster or Wikitionary. | 1 |
I know you can draw a protractor with TikZ. The problem is that my students use the triangular shaped one like this. So in order to make it a little bit more familiar to them, I am wondering if there is also a predefined one like this one? | 1 |
Is there a particular word for a joke or a humorous story which has a moral to it? In a way, something that is similar to a fable, but with the humour implied. | 1 |
I have read several explanations of standard deviation and z-score, I know how to it calculate them but I am not sure what is differences betwen them. Can someone explain it to me? When is suitable to use stdev and when z-score? | 1 |
I want to have an answer with that question above for my physics lesson. I really don't have an idea about it, so, I ask help from you guys and hope that someone can help me with it. | 1 |
I would like a way to convert a document from HTML to LaTeX, on a Windows platform. A main motivation of mine is for ways to display books from Project Gutenberg. such as, Wells' The Invisible Man. What is my best option? | 1 |
I am trying draw a line of distinction between these three events. As I understand it: Ritual is somewhat related to a religion. Festival is associated with a group of people and that brings happiness. Ceremony is something that is followed by a group of individuals before performing a task. Can someone please tell me if I am wrong, and also provide some examples? | 1 |
In one of his lectures Richard Feynman, a great genius and a 'naughty Bronx kid', refers to to the Coulomb force, electricity as "the screwing force". Apart from the obvious joke and double entendre, can you explain that original definition and in what way it is different from other forces or from an EM wave? | 1 |
Could somebody suggest a single word for 'I think it is right but not exactly sure about it'. I can say 'I am almost sure' but wondering if a word exists with same meaning. | 1 |
Does present perfect in conditional only mean future situations? Can it be used for hypothetical future? When I went to Africa, I thought as if I have already been there. If you have studied, you would pass the exam. | 1 |
I was wondering why you would say "There is people coming" as you can hear in the last trailer of Game of Thrones. English is not my native language but I'd think that you have to use plural in this sentence such as "There are people coming". Is this "urban"-talk or am I missing something? | 1 |
I am not very good at speaking and listening English. Can someone please suggest some songs, which have clear pronunciation of English words, to listen and understand the songs too and also I can use them to improve my vocabulary. Actually very fast music, especially those with too many and loud musical instruments never helped me understanding the lyrics. | 1 |
What is the physics behind welding iron? It is obviously the electricity that causes the two metal parts to fuse but what is the role of the welding rod and why is it said to damage your eyes when you look at the spark. Is it just the brightness, or does it radiate a specific wavelength that is more damaging, such as UV rays? | 1 |
The universe is believed to have originated from absolutely nothing, and we know it is still expanding. Physics says "something can arise from nothing". I understand how mass and energy are related and one can take the form of other. But, how can everything arise from absolutely nothing? | 1 |
I am pretty new to Turing Machines and I am trying to understand the basic things first...so my question is , would this machine accept all words ending in 'a' ? if that's the case would the REJECT state be all string without 'a' and ending with 'b' ? | 1 |
Is this sentence correct? She will grow up hating what she sees in the mirror. Or should it be: She will grow up hating what she will see in the mirror. I think first one is correct, I just want to know why and the rule. | 1 |
"packet" and "package" are synonyms when we refer to mailings, but does the same apply to "network packet"? My co-worker frequently says: "network package". It's like nails on a chalkboard to me, but is it correct? | 1 |
Which one is more proper to use: 'allocable' or 'allocatable'? Sources say the former is derived from the original Latin word 'allocare', while the latter is a part-of-speech-variant of the English word 'allocate'. Also, is there a standard rule in English to form able-ending adjective of words terminating in 'ate'? Thank you. | 1 |
I need to find uses and interesting questions by using jacobian matrix for a project work ,can any one help me. I found jacobian matrix is used in dynamical systems, but i didn't understand it.Is there is any question in dynamical systems which is connected to jacobian matrix | 1 |
I have the same problem like here: How to create custom section titles with a "<title> <number>" format in ConTeXt? But I would like to solve it in LaTeX. Is there a simple way to adapt code from the @phg's answer? | 1 |
If I tell you the real and imaginary parts of the index of refraction for all frequencies, name a property that can't be predicted based on that information. If you're assuming this is a gas, specify your answers to properties measured in gases. Likewise for solid, etc. edit: I see my question is not a good fit for this site: https://physics.stackexchange.com/help/dont-ask My apologies! | 1 |
I am making a small book and I want to put a phrase in both pages like the picture above, I want to keep the chapter title and page numbers. Could you give me a hand on this? | 1 |
Well, our professor in class posed a question to all of us: Is frequency a scalar quantity? The obvious answer, of course, is yes, it is, because it does not have a direction associated with it. But then, a scalar is defined as a coordinate invariant quantity. In the case of frequency this obviously fails (the Doppler shift). So how do we classify it? | 1 |
Is there a general name for the following properties, (similar to the properties of existence of an additive identity, existence of multiplicative identity etc): For any given set, the intersection with the empty set results in the empty set. For any real number, multiplication with zero results in zero. | 1 |
I have a question that is short and sweet: Are spectra (both fluorescence and absorbance) of any molecule dependent on temperature? In particular, is the spectral lineshape function of any molecule dependent on the temperature (so, kinetic energy) of the surroundings and possibly itself? | 1 |
Why is this a wrong Triangulation ? I have to say, we had triangulation at the end of the topology course, so not in details. And the professor only mentioned the basic rules for the triangulation, but in this case, idon't know why it fails. | 1 |
I was reading the book "Theories of Integration" by Douglas Kurtz, and I have a question about the following proof from the book. Specifically, would it be valid to replace the argument that follows "It remains to show that A satisfies the Definition [of Riemann Integral]" by: Thanks! | 1 |
If it's infinite, is it countable or uncountable infinite? I am a newbie to this topic... I don't know what modular arithmetic for polynomials means. Can someone please give me a link where I can learn? | 1 |
I have problem with sentences structures. I have sentences: I specialize in design wireless and wired network infrastructure, configure devices company's Cisco Systems and MikroTik, and security and techniques used successfully to protect IT resources. Additionally, I have knowledge of voice over IP (VoIP) technology. I am not sure, is this sentence grammatically correct? Thank you in advance for your help. | 1 |
If one rotates a function such as the sine function about the origin, is there a general method to find the taylor series for the rotated function? Assuming of course that the rotated function is still a single valued function. | 1 |
I would like to find a mathematical function like the one I sketched below. My first idea was to rotate a sin function, but now I don't think that would work because I would like the function to be well-defined so that for one x, there is only one y. | 1 |
I understand that the quadratic equation can solve any second order polynomial. Furthermore, equations exist for polynomials up to fourth order. However, without a graduate level degree and a deep understanding of mathematics, is there an explanation of how we can prove that the equations for solutions to a fifth order and above don't exist? Thanks in advance. | 1 |
Suppose you met a famous person, and you were shy and anxious and almost overwhelmed by them. Is there a word for describing that? Similar to getting stage fright, or "choking", except in this case for a person? When he said hello to me, I couldn't respond. I (was) __________. | 1 |
When two nouns come together like taxi driver, the role of the first noun is noun adjunct. Now the question is what is the second noun's role. I mean the role of driver in taxi driver. Thanks | 1 |
I feel like it could mean either "what you are capable of doing," or "what you are willing to do." Do one of those better represent the meaning of this phrase or are they both right? | 1 |
I've been trying to look at stopping times and continuous time change in martingales but have trouble understanding without some concrete examples. Anyone knows of any good references that might be helpful? Thanks! | 1 |
A wire has cylindrical symmetry, therefore we should consider the possibility of the induced by field in the p,phi and z directions. I know from the right hand rule that we only get a field in the phi direction but I'm not sure how we show that there is no field radially or along the length of the wire. | 1 |
I wrote the following sentences: Eyed closed, he imagined the moment disintegrating, returning to the stars, and continue existing there for eternity. Eyed closed, he imagined the moment disintegrating, and returning to the stars to continue existing there for eternity. Now, I'm not sure if I should say continue existing there or continuing existing there. | 1 |
Suppose I somehow know propagator for a given quantum mechanical system but I don't happen to know either the Lagrangian or Hamiltonian. (For simplicity, assume that this is non-relativistic.) Is there a procedure by which I can recover the original Lagrangian? | 1 |
I used to say cleats but found it uncommon for some people, though I had no trouble with soccer shoes. I have always lived in a Spanish-speaking country (Nicaragua) so I find it hard to know why that is. Are cleats only used in some places? Wikipedia also mentions football boots. | 1 |
Which is a good book to refresh discrete maths fundamentals for a grad student? It would be great if the book has short and terse explanations of concepts with lots of worked out examples(/to be worked out exercises) to set the brain rolling. Can someone suggest a similar refresher for graduate level algorithms? | 1 |
Given two latitude and longitude points, the bearing with respect to north of a great-circle path starting at each point, and the distance between the two points, how can I calculate the latitude and longitude of the intersection of the two paths if it exists? | 1 |
Can anything be stated about the distribution of the digits of Pi, i.e., if I were to sample n digits of Pi, can anything be said about the probability to observe certain digits, or is there any reason to assume that they would not be evenly distributed? This is purely a curiosity question. | 1 |
Recently I have considered the following question: for a sequence of i.i.d. random variables(maybe normal distribution), the expectation of the maximum of n such kind of variables is dependent on n, so if n goes to infinity, will the expectation of the maximum of infinite i.i.d random variables be infinite? What is the upper bound of it? | 1 |
What is a polite way to describe a person as "white-washed", i.e. a person of visible color who acts and talks and cultured the way a white Western person is. Or is white-washed OK ? | 1 |
So I am filling out a CV and answering about my education, when it comes up 'year obtained' I have never come across this on a CV before and if I have it hasn't been worded this way. Could someone help me? I am confused about whether it asking me the year I started or left, Thank you. | 1 |
What would be a good term for the subject of a requirement? If one has a requirement applied to them, they would be the [word] of that requirement. I'm looking for something more descriptive than subject or target. Constrained seems like a good fit, but it feels a bit unwieldy? | 1 |
Is there a non-collective noun for an "instance" of publicity? In other words, a restaurant receives publicity every time a local newspaper publishes a review or an article about it. Each of those articles or reviews are examples of a [blank] for the restaurant? | 1 |
We know that the ring of analytic function on a connected open set is a Bezout domain. Do we know what happens if we remove the hypothesis of connectedness? It is no longer a domain, but does the ring share the same nice properties like: every finitely generated ideal is principal? | 1 |
The other day I was talking to a friend about when to use "middle" or "center". I was using it in the context of top, middle, bottom, as a listing, and he suggested it should be top, center, bottom. I want to know whether it should be middle or center. | 1 |
I have a feeling that this usage - which I personally find highly irritating, because it suggests either that the initiator of a conversation is helping a person who is in dire straits or that they themselves are in trouble and seeking help from a lifeguard figure - became popular in California, but is that correct? | 1 |
Recently, I am studying Chinese Zodiac Compatibility. They said "Snake (one born in Snake year) and Rat (one born in Rat year) are a volatile pair". I am not sure what "volatile pair" mean? like each person can go to different direction in their life or something like that? or they just do not like to each other See the website here http://www.travelchinaguide.com/intro/social_customs/zodiac/compatibility.htm | 1 |
What are the Ishibashi states and Cardy states in CFTs? I am familiar with conformal field theory language. It would be great if someone can discuss about the basic idea of these states and their applications. | 1 |
If a rubber ball is red, I know that it is absorbing all colours except for red, which it is reflecting. So there is not actually a part of the object that contains any red. But what tells an object to reflect the light that it does? Is it something in the surface that does not let that wavelength enter it? Thanks. | 1 |
I have always wondered and once I even got it, but then completely forgot. I understand that gravity causes high and low tides in oceans, but why does it occur on the other side of Earth? | 1 |
Which of the following is correct when addressing an audience or more than one person? Or are both equally valid? I hope you have all had wonderful summers! OR I hope you have all had a wonderful summer! | 1 |
Please forgive my stupidity. So many years after my undergraduate study and so many years after dealing with various concrete ODEs and PDEs, I still cannot tell the essential difference between them. What specific belongs to PDEs but not to ODEs? What conclusion for ODEs cannot be generalized to PDEs? At the moment, my understanding is simply that PDEs have more than one variables. | 1 |
Is it okay to use ain't in formal conversation? I know ain't can be used for am not, is not, are not, have not, has not. So if I can use it in day-to-day life, it will be easier for me I guess. | 1 |
As an ESL I'm not sure if I can use the following sentences: You can take no other directions. I'm using it on giving indications to a foreigner. Should I use instead: You can't take other directions. Which one do you think it is the most natural/idiomatic? | 1 |
Can someone give me some information about this area? PDEs on non-cylindrical domains I take to mean parabolic (let's fixed parabolic) PDEs on domains which evolve in time. What is the state of the art on this topic? What kind of problems do people consider? What tools are used for existence and uniqueness? Any recommended papers? | 1 |
Sometimes I feel uncomfortable to say "How do you spell xxx ?". It sounds like asking his or her own way of spelling a word implicating that I am not necessarily expecting the correct answer. Is "How do you ... ?" a polite question to ask the right way to do things ? | 1 |
I'll take the sky diver example. Right when a sky diver jumps out of the plane the net force of the diver is greatest. Then the diver begins to reach terminal velocity where the force of resistance = the force of gravity. So while the force of air resistance increases to equal the force of gravity is the sky diver decelerating? | 1 |
I am looking for exact or perturbative solution realistic lotka-volterra (the one with logistic term in one of the equations) equations in population dynamics. Any reference where they have done it will be useful. | 1 |
I'd like to know whether the phrase "where I be" is grammatically incorrect or whether it is correct if in the subjunctive mood. If it is in the subjunctive mood, what exactly would it mean? The entire example sentence is: I look for a place where I be free. | 1 |
Idiomatically we do say "a strong will". But can we say "strong wills"? The context is The optimism and (the) strong will(s) of the handicapped children touched me deeply. Also, do I need a "the" before "strong will(s)" in this sentence? Thanks. | 1 |
Does a direct limit of projective need to be projective? And is the inverse limit of injectives injective? I guess they need not, but I can't find an example. Can you help please? | 1 |
Is this sentence grammatically correct? [This method] binds a handler to one or more events to be executed once for each matched element. source Is it just a contraction of the following sentence? This method binds a handler to one or more events, that is (supposed) to be executed once for each matched element. | 1 |
Did Feyman suggest even though Q.M. has great predictive power no one will ever really understand it ? Some people have said there may be hidden variables that explain underlying principles of Q.M. but has this been ruled out? Has Q.M. been put in an axiomatic framework? | 1 |
I have difficulties in using each. Which would be correct in the following sentences? They are each connected to a hydrogen atom/hydrogen atoms. They each are connected to a hydrogen atom/hydrogen atoms. They are connected to each hydrogen atom/atoms. [Assuming that each of them is connected to one H atom.] We each have our own car/cars. [Assuming that each of us has one car.] | 1 |
After reading the Wikipedia article about procuration, I'm still confused. Here's what I want to know: What does the author mean by "the phrase per procurationem is ambiguous if used with undeclinable English names"? If I sign a letter on behalf of someone, is this protocol acceptable? Sincerely, Secretary's Signature p.p. Account Owner's Name The author implies this method is debatable. What's the debate? | 1 |
How is the meaning of a sentences affected by chosing one of those words? For instance, what's the different between The screech cicadas reverberated through the forest. and The screech cicadas reverberated throughout the forest. | 1 |
This is the word problem. If they work together, John and Vince can finish their project in Biology in two days. If they worked individually, it will take John three days longer than Vince to complete the task. How long will it take each to do the job alone? Thanks in advance ;) | 1 |
In soccer, if a player waits for another player to get into a proper position before passing the ball to him then can I say "That was a nicely waited pass" or would that be grammatically correct? | 1 |
I see the British normally use plural form of the verbs associated with collective nouns. An example, "The team have fired its coach" versus "The team has fired its coach". I have been told this is slang that has become mainstream. Any idea as to its real origin? | 1 |
I understand the nature of light can be complex and has extensive theories/experimental data. We hear light can be both a wave and particle, so why can't it be both, a wave of particles? | 1 |
By this, I mean someone who is not extremely religious, but, in a time of crisis, will turn to religion for hope. An example would be a mother who prays if her daughter is kidnapped, but does not pray on a daily basis. Is there a word for this? | 1 |
Here are two sentences patterns: Have you ever been to the opera when you lived in Milan? and Did you ever go to the opera when you lived in Milan? What is the difference between them? How can we say, which is right sentence? | 1 |
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