Apply Definition and 483 Threads

I know this may sound strange, given that we cannot really work out where in space a photon is because it cannot be completely stopped. But here's a thought. Let us assume that a photon has been emitted in vacuum going in a straight line. At any given moment in time, this photon will have...

Hello! :D I am given the following exercise: In $\mathbb{Z}_7$ apply the Euclidean division, dividing $[2]x^5+x^4+x^3+[3]x^2+[2]x+[2]$ by $[3]x^2+[2]x+[3]$. That's what I have done: $$\text{ the units of } \mathbb{Z}_7 \text{ are: } \{ 1,2,3,4,5,6\}$$ We want $[3]x^2+[2]x+[3]$ to be monic,so we...

Homework Statement A tight string lies along the positive x-axis when unperturbed. Its displacement from the x-axis is denoted by y(x, t). It is attached to a boundary at x = 0. The condition at the boundary is y+\alpha \frac{\partial y}{\partial x} =0 where \alpha is a constant. Write the...

Hi all, Generally boundary condition (Dirichlet and Neumann) are applied on the Load Vector, in FEM formulation. The equation i solved, is Generalized eigenvalue equation for Scalar Helmholtz equation in homogeneous wave guide with perfectly conducting wall ( Kψ =λMψ ), and found, doesn't...

I'm starting to do some research into what grad schools I should apply to this fall for a pure math PhD. I'll be finishing my undergrad in May 2015 with a major in math and minor in physics. I'm not 100% sure what area I want to go in to, but I'm leaning more towards the topology and geometry...

Homework Statement If C = A × B, A points up, and B points south, which direction is C? Select one: a. west b. up c. north d. down e. east Homework Equations The Attempt at a Solution i used the right hand rule and got east as the solution could i have a little verification...

Hey! :o I have the following exercise: Apply the divergence theorem to calculate the flux of the vector field $\overrightarrow{F}=(yx-x)\hat{i}+2xyz\hat{j}+y\hat{k}$ at the cube that is bounded by the planes $x= \pm 1, y= \pm 1, z= \pm 1$. I have done the following...Could you tell me if this...

Why do trigonometric ratios have to be related to the angle between the base and hypotenuse of a right angle triangle? I am trying to understand why I can't use these ratios to any angle of a right angle triangle. I try to do that in the attached document. It seems to work for all ratios...

Hey! :o Apply the divergence theorem over the region $1 \leq x^2+y^2+z^2 \leq 4$ for the vector field $\overrightarrow{F}=-\frac{\hat{i}x+\hat{j}y+\hat{k}z}{p^3}$, where $p=(x^2+y^2+z^2)^\frac{1}{2}$. $\bigtriangledown...

Hey! :rolleyes: I am looking at the following exercise: "Prove that $\forall n \in \mathbb{N}$ the number $17 \cdot 3^{2n+1}+41 \cdot n^2 \cdot 3^{n+1}+2$ " is not a square of an integer." We do it like that: $a(n)= 17 \cdot 3^{2n+1}+41 \cdot n^2 \cdot 3^{n+1}+2=3 \cdot (17 \cdot 3^{2n}+41...

Hi, I'd like to argue Heisenberg doesn't apply to a collapsed wave... I always interpretted the Heisenberg Uncertainty Principle (HUP) as follows: 1. HUP is *not* about measurement problems, it is fundamental 2. When (f.i.) an electron is a wave: HUP applies. The electron really *has*...

Should I apply to Southern California Institute of Technology (SCIT)? If you attended that school, can you tell me how difficult it is to get into that school? I know that students have to take the entrance exam to get into that school for admission in verbal and math, but what level of math is...

Say for example I discovered how to unify General Relativity with Quantum Mechanics and then someone else uses this improved understanding of physics to engineer a new product which would have been impossible without it. Am I entitled to a portion of the revenue generated by the new product...

Eg. If I ionised myself (ignoring other problems) would I fall through the floor and eventually stop moving at the center of the gravitational body I was on (assuming I didn't make an orbit).

I want to major in electrical engineering at college but should I apply for Purdue University? If I graduate from that college, will I get a job without difficulty? I don't care about the prestige in college. I just want to receive a good education in electrical engineering and get a job after I...

I am not sure how this company found me (I'm thinking Monster or LinkedIn - I didn't want to ask) and they want to do a technical interview Monday for a position as a patent classifier. I was told by the woman I spoke to this evening that a patent classifier is a very analytical job that also...

What is a contraption I can make at home somewhat easily to apply a constant force to a block? I am doing an experiment on how far the block will slide. I was thinking about making some sort of pendulum but would love to hear some of yours guys ideas. Thanks

How can we demonstrate that the symmetries of S-Matrix can be applyed to parts of Feynman diagrams?The S-Matrix is the sum of infinite diagrams,why we know each or part of each diagram has the same symmetries as the symmetries of S-Matrix?

Can undocumented students get private student loans? I'm a senior and I want to apply to colleges but don't know what college is best for me. I'm applying to MIT, Boston University, MSOE, Worcester Polytechnic Institute. But can someone recommend me a few other no loan colleges that have strong...

Hello guys, I'm having some trouble reading two circuits : Here they are : In the first one I need to Determine the Thevenin then the Norton Equivalent of the circuit. For the second one I have to find expressions of the current I1 flowing through the R1 resistor, I2 in R2 and then...

Hi, Suppose I have \lim_{r\to 0} \left\{\int_0^{\pi} \frac{f(r,t)}{r^2}dt - \int_0^{\pi} \frac{g(r,t)}{r} dt\right\} and both integrals tend to infinity. So I combine them: \lim_{r\to 0} \int_0^{\pi} \frac{f(r,t)-r g(r,t)}{r^2} dt now at this point, the numerator in the...

Most of the proton REST mass is energy anyway. So how does that work?

Hi all, May be this topic has been discussed many times in forums. I am a design engineer(experience of 2+ years in control systems, embedded) from India wishing to pursue my masters in applied physics(optics or solid state physics or photonics). I took the ielts exam and got overall...

I graduated 4 years ago from a small university and received a dual BS in EE and physics. I went into a decently ranked EE PhD program but dropped out after a year. I attempted to go back a couple times but just didn't care too much for the courses and dropped my classes both times. I have...

Hello, SCENARIO : I am a game developer and I am playing around with rigidbodies. I have a piece of wall which might get impact by an external force. The wall has in turn several other broken pieces (hidden for the moment) put up together to resemble this huge wall. Upon impact I switch...

Homework Statement A large electroscope is made with "leaves" that are 78-cm-long wires with tiny 24-g spheres at the ends. When charged, nearly all the charge resides on the spheres. If the wires each make a 26^{\circ} angle with the vertical, what total charge Q must have been applied to...

If I was a physicist and did research on superconductors can I apply it and make a product or a prototype on my own?

The total energy of a particle in a harmonic oscillator is found to be 5/2 ~!. To change the energy, if i applied the lowering operator 4 times and then the raising operator 1 times successively. What will be the new total energy? i want the calculation please

Hi, this fall I'll be a senior in high school and with the Common Application nearly out, I need to finish my final college list. The reason I'm posting on this forum is because my goal is to ultimately attend grad school for a PhD in physics. This is my current list that I've come up with after...

I have found an error in the QFT book by Mandl & Shaw, 2nd ed. In eqn (8.53), there is a minus sign in front of e^4. However, this cannot be justified on the basis of how the equation is derived. In the unnumbered eqn below eqn (8.52) there is a minus sign, and the trace in this eqn is to be...

In my textbook it tells us ∫B ds = I μ (line integral and I = current enclosed) It also states that the current not enclosed does not affect the magnetic field along the line. I don't see a reason for other currents outside the loop not to affect the magnetic field thanks for any help

"when we apply AC to an inductor (pure inductance), the current will lag the applied voltage by 90 degrees. " how this happens? why current lags applied voltage by 90 degrees? :confused:

Stats after the fall semester (the time I will be applying for graduate school for Physics) Best case scenario I will have a 3.4 cumulative GPA, 3.85 Physics GPA, and a 3.0 Math GPA Dual Mathematics and Physics major, took 5 years to complete. 1st - 3rd year grade were par or less...

I want to apply for b.s. Physics as an international student to get quality education, can someone please name such universities all over the world(except MIT,caltech and others biggies) which can provide scholarships. I'm from india, 18yo

I am under graduate (Bachelor of Science) in Physics from Gujarat University. I have passed following papers during my study in 3 years. (I did not found 2 papers from Gujarat University website so I have given reference for rest of papers) Second Year Bsc Syllabus...

Homework Statement Well, this thread is purposely to clarify my question on the use of L'Hospital's rule for sequence. As I have read from the calculus book, the sequence can be defined such that f:N → ℝ with function f(n)= an where n inside natural numbers,N. So, we cannot apply L'...

Hi people, I have a question. Where can we apply the first law of thermodynamics? I mean is it applicable between 2 equilibrium points? Or between a reversible process? When we consider free expansion of a gas into vacuum, we apply the first law. But since the process isn't reversible (or even...

Homework Statement Is the series convergent or divergent? \sum_{n=0}^{\infty}{\frac{1}{\sqrt{n+1}}} Homework Equations I can use any test but wolfram alpha says that it is divergent by comparison test. The Attempt at a Solution How do I apply comparison test? I can compare it to: \sum _{...

I'm looking to apply for a PhD program in Medical Physics. I am currently majoring in Medical Physics, but my GPA is only a 3.33. I have been doing research and see people who are applying with much higher GPAs than mine. My question is: if I don't get accepted anywhere, what should I do?

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...