Apply Definition and 508 Threads

I'm studying special relativity and this does not make any sense to me: I understand the lightclock example of how time dilation works. But I don't understand how it applies to other things. This is probably a stupid question, but I can't figure it out.

My doubt is that whether we can apply non-linear smoothing to a almost linear data ( without one or 2 discontinuity) I have attached the pic in which the red data is the smoothed one. Blue is the original one. I multiplied each point with an increasing like 1, 1.1, 1.2, 1.3, 1.4...so on...

I've searched the web for caustics and optics, but mostly see pictures of them. They seem to have some positive use. In some fashion they seem to magnify. They seem to be somehow related to critical curves, whatever they are. Both seem to be helpful in gravitational lensing. How?

Homework Statement I have a series Ʃ(1 to infinity) ((-1)^n*n^n)/n! Homework Equations The Attempt at a Solution apparently you cannot use the alternating series for this question, why is this? It has the (-1)^n, what else is needed to allow you to use the alternating...

So I applied to four grad schools, my PGRE score was 830 and my GPA is a 3.92, but I've already been rejected from two of the schools and haven't heard back from the other two, which leads me to believe I'm going to be rejected from all four of the schools I applied to, leaving me with no...

I'm scrambling to complete my dissertation before the end of the semester but I'm not sure if I'll make it in time (deadline is May 6th). I feel like if I had an additional month or so I could definitely complete all the requirements (defense, revisions, etc), but then my degree would not be...

so let's say i have a motor and two sinusodial AC power supplies. they both have different frequencies but the same voltage. i apply both of them into the induction motor. what will happen in terms of speed or anything else which can affect the motor's performance?

I had a serious problem when I read my first book on calculus-based physics when I came to the center of mass & moment of inertia sections of my books. I really freaked myself out over the fact that even restricting ourselves to the most common & ideal geometric objects the list of things you'd...

Hi, my name is Alejandro. I'm a Spanish physics student and I'm in my first year of university here in Spain. Spanish university is of the worst in Europe and I wanted to start again my Physics degree (we call it degree here in Spain, I don't know how it's called in other countries) in another...

A photon has an energy correleated with its frequency. Photons can interfere. Can the same be said for other bosons, like the Higgs?

Aside from learning all the tools to solving differential equations and taking derivatives, I've been trying to practice actually applying this knowledge to the creation of my own equations to find out certain things. Where I'm uncertain is, have I achieved the actual expression? Let's start...

I know the school that i'd like to go to(Clemson) it's close to home, the program is more applied than theoretical, the campus has a nice home-y feeling to it, i very much like the graduate programs that I'm looking at (mathematical sciences and computer science), etc. I know people say that...

I really want to do an reu this summer and experience research from a new perspective. I have a fine resume. Near 4.0, rising senior, and almost 2 years of experience leading to a 2nd or 3rd author publication in the works. I know NSF puts a lot of emphasis on accepting women and minorities...

Homework Statement If we fix one end of a spring and apply some force on the free end,the spring will elongate.If we remove the force,the spring will return to its original length(assume that Hooke's law is obeyed). Metals are usually ductile due to their metallic bonds.In metallic bonds...

For Academia jobs, I used www.mathjobs.org, and it's quite good. I will have a degree in Applied-Mathematics (Numerical Optimization and Operation research). I am trying to apply for Industry jobs. However I am not sure how or where to apply. I heard the application process can be quite...

Question: Show that the system x'= x-y-x[x^2 + (3/2)y^2] y'= x+y -y[x^2 + (1/2)y^2] has at least one periodic orbit. I know that I need to apply Poincare-Bendixson Theorem. I can prove the first three points of it easily, but to create a trapping region, I believe that I need to...

If I am traveling along at a steady 60 kph in top gear ... and say my tacho is showing 2000rpm, then my "torque curve" says for this rpm the engine is outputting a specific torque - as I understand it, this is what is needed to zero out the forces from wind resistance and other frictional...

Let's say I see a parked car, the tire of the car is resting against the curb. Would you actually have to go with a tape measure and measure the curb, measure the wheel and then you'd be able to find the area underneath the curb and the tire? It's just confusing. Soooo many math equations...

I have a time series of climate data that I'm testing for stationarity. Based on previous research, I expect the model underlying the data to have an intercept term, a positive linear time trend, and some normally distributed error term. In other words, I expect the underlying model to look...

Does Snell's law apply in refraction when the light ray is along the normal line? Utilizing snell's law, the index of refraction (n) would be zero. nr= ni(sin θi)/sinθr Sin(θi)= 0 therefore, nr=0 However,utilizing the formula for index of refraction (n=c/v), the index of refraction...

Hi all, thank you for reading this post! I am applying to US grad schools this year. Currently I have two PRD publication, one 1st authored, one 2nd authored. I have another publication on some low-level journal. I have also one paper submitted to PRL, 1st authored However I have some bad...

So, how do people, like physicists, or engineers, actually apply the concepts of vector calculus to their work. For example, if they want to calculate flux or something they need a vector field, how do they approximate that vector field? are their specific equations that can approximate vector...

Hi, I am confused by this relatively simple problem. The operating margin of a business = (Revenue – costs)/Revenue M = (R-C)/R = 1 – C/R Now I wish to find the sensitivity of M to changes in R. So I try to differentiate the equation by R dM/dR = C/R^2 But this equation doesn’t...

I have attached the problem. I know I need to apply the energy equation: P1/(gamma1)+V1^2/(2*g)+Z1=P2/(gamma2)+V2^2/(2*g)+Z2+h_t+h_f-h_p+h_m P=pressure V=velocity g=gravity Z=elevation h_t=head due to turbine h_p=head due to pump The above 2 are 0 since there's no turbine and pump...

Let $$f:U \to \mathbb{R}^3$$ be a surface, where $$U=\{(u^1,u^2)\in \mathbb{R}^2:|u^1|<3, |u^2|<3\}.$$ Consider the two closed square regions $$4F_1=\{(u^1,u^2)\in \mathbb{R}^2:|u^1|\leq1, |u^2|\leq1\}$$ and $$F_2=\{(u^1,u^2)\in \mathbb{R}^2:|u^1|\leq2, |u^2|\leq2\}.$$ While the first...

Why is it that everything is so so different between the two worlds ...?

I'm a graduate student at MSU getting my M.S. statistics right now. The department I'm in is the "Department of Statistics & Probability" and the majority of the courses I've taken have actually been probability related. I'm applying to PhD programs right now, and my interest is more in...

(Put in a lot of context, and post is long now. Question and TL;DR are at the bottom!) Recently finished my PhD in Physics: X-ray spectroscopy of transition-metal crystals, a lot of soft X-ray synchrotron and solid state science, vacuum science etc. I knew after a few months of starting the...

Why do magnetic fields only apply force to charges/currents that are perpendicular to the field? Does it have something to do with the orientation of the field created by the moving charge in relation to the field it is in?

I saw a baseball pitching machine that throws baseballs at 40-70mph with one wheel... All that wheel does is rotate and as the ball touches the rotating wheel it accelerates and comes flying out of the machine at an appropriate angle.. My question is: what is the physics behind that wheel on...

I’m thinking as I go, here, so I am numbering points for ease of reference, correction etc. 1. Neutrinos (excluding the anti- and sterile varieties) come in three flavours. 2. It is known that neutrinos have mass. 3. The masses of individual neutrinos are not known precisely. 4...

Hello, I am currently in my final year at a California State University majoring in Mathematics (Applied track) and minoring in computer science. I've begun lurking forums such as the physics to figure out what sort of programs I am qualified to apply for, and what be good opportunities as well...

Hello Mate, This is my first post and I have always seen you guys are helpful to everyone. Thank you for all the knowledge you share from time to time. I am an Indian student pursuing my Final year in BSc (Physics). I would like to apply for Master in Science, Physics at University of British...

How to face a data processig to apply "swinging door algorithm" to a irradiance time Homework Statement I would like to obtain the relevant (irradiance change, time increment) pairs from a irradiance time serie that I have in Excel and Origin. One way to do that is making "swinging door"...

Poynting vector is flow of energy per unit area. Dose it apply for both static field where E and B are decoupled, AND time varying EM field where E and B are coupled?

I have a box, the bottom and the four walls are made of grid. I wan to apply load in the box and see how the bottom and the four walls deform (and stress too). How can I do it? I do not want to apply a force to each wire vertically and horizontally. I want to apply a load to the bottom and the...

Newton's Third Law states that every action has an equal and opposite reaction. I'm wondering if and how this applies to magnetism. I would assume that it would mean if a moving charge is creating a magnetic field that causes a magnetic force on another charge, then it can be said that the...

I'm a community college student and I want to transfer to a 4 year institution to get a BS in Math or Computer Science (or a major/minor combination of the two). Anyway, I've been thinking of applying to UCs (University of California) and the Cal Polys (part of the Cal State system, but good...

Had a recent midterm and got this question wrong: why is Hess's Law generally not obeyed? Any ideas? Thanks.

Homework Statement Very simple problem; I have three classes, Company, CompanyTest, and Employee. CompanyTest gets a bunch of information together about an employee, like salary, address, etc., and then it creates an Employee object using the Employee class. Great, so I have successfully...

[b]1. The problem statement, all variables and giv A construction worker is pulling a bucket filled with wet cement using a smooth pulley. The total mass of the bucket is 5kg. Homework Equations F=ma The Attempt at a Solution F=5*2ms^2 = 10 N The answer is 60N

I am currently in a post-doc position which will end in eight months. I intend to remain in this position for the remaining duration in order to finish my current project, get a publication, and move on. How early is too early to start applying for industry positions? It's my impression that...

I'm in a rather weird scenario. My first four years of college, I wasn't interested in studying or macadamia in general. I was a finance major and realized that I was learning an extraordinary larger amount at work then I was in class. I'd go to work and learn how to analyze investments using...

Disturb a complex massive field, apply "force"? If we have a classical massive complex field in 2D space-time can we think of it as a 1D membrane which can move in some 2D tangent space? If so can I think of applying forces which act for short times to this membrane in this tangent space, as a...

Can anybody clear this up for me? In his Chicago lectures in 1930, Heisenberg is quoted as saying “The uncertainty relation does not hold for the past…If the velocity of the electron is at first known, and the position then exactly measured, the position of the electron for times previous...

Suppose that I would like a master's in physics, but not a PhD, and consider a university that offers a funded master's program. I understand that universities prefer to take PhD students rather that MS students (since one may squeeze more cheap research labor out of a 3+ year grad student...

Hello I am new with Maxwell. I made a motor drawing in solidworks and imported it in maxwell. I found some tutorials, and searched on the internet but could not find answer to my problem. So when i try to assign Excitation Current to an coil i get the message Excitation 'Current1' : Cannot...

Hi, I assume that you all know the water displacement theory where: The volume of water displaced is equal to volume of completely submerged object. Now, my questions is this: does this theory work for other liquids besides water (e.g. mercury, seawater)? If not, then can you please...

Pretty sure I have some misconceptions, please correct me thanks. SHORT VERSION According to Nyquist's theory, if I want to digitally record a live opera and be able to reconstruct back to exactly the original sound quality, I have to sample at at least twice the frequency of the original...

Homework Statement Consider Atwood's machine with two masses, m1 and m2 with m1 less than m2. Now, according to application of Newton's third law, the system accelerates in the direction of the heavier mass (here, m2). This, however, seems to contradict Newton's third law, which implies that...