Term Definition and 738 Threads

What does the term "Action" means in physics? What does the term "Action" means in physics?

I am reading the manuals of an electronics measuring instrument, in which the term 'float' is repeated several times. Can anyone explain this term? Thanks in advance.

such as strain gauges/ thermistors etc., which give you a reading of one value (ie strain) after measuring something completely different but related (ie change in electrical resistance)

Can some explain me why first order term in perturbation expansion of scattering matrix gives no contribution for every possible IN and OUT states? It is said that this is connected with the fact that condition of energy-momentum conservation cannot be satisfied for real photons and electrons...

Homework Statement See picture It's (sigma) from k (possibly n?)=1 to +infinity of U_{k} = 2 - (1/n) I'm asked to find: U_{100} limit as k goes to infinity of U_{k} and sigma from k=1 to inf. of U_{k} Homework Equations If I'm not mistaken, 2 - 1/n is the closed for for...

Does anybody know a good topic for a classical mechanics term project. I just don't have any ideas. It can just be a high degree of problem solving for a traditional trivial question or be a Phenomenon.

[SOLVED] Finding the nth term of the maclaurin's expansion of sqrt(1+x) Homework Statement Find the nth term of the Maclaurin's expansion of \sqrt{1+x} Homework Equations The Attempt at a Solution so far I've expanded and gotten...

One of my tasks these days is reseaching about long term reactivity control on a typical PWR. As I know in the long term reactivity control we must consider to the role of burnable absorber and boric acid concentration in reactor core during its operation cycles. So I want to do some...

1. Special Relativity 2. Homework Statement Consider this Lagrangian: L=(1/2) (\partial_{\mu} \Psi)(\partial^{mu} \Psi) + \exp(-(a\times \Psi)^2) Have this field a mass term?Homework Equations The Attempt at a Solution

I am just curious, can frequent masterbation have a permanent reduced sperm count side effect in the long run ?

I know how to write down solutions of wave equation \partial^2_t u(t,x) = \partial^2_x u(t,x) for given initial u(0,x) and \partial_t u(0,x) like this u(t,x) = \frac{1}{2}\Big( u(0,x+t) + u(0,x-t) + \int\limits^{x+t}_{x-t} \partial_t u(0,y) dy\Big), but what about \partial^2_t u(t,x) =...

Hi, folks, Is the exponential (repulsive) term in Born-Mayer potentials supposed to be exp(-r) or exp(1/r)? - r is the interatomic distance; constants ignored I've seen both versions pop up in what appear to be reputable sources. The second one seems to be more popular, but, to me at...

Homework Statement Find an expression for the nth Term: { 1/3, 1, 7/5, 5/3, 13/7 } Homework Equations The Attempt at a Solution The problem has obviously had its fractions reduced on almost every case if not every case. I've been working on this problem for at least 4...

a scientific umbrella term that encompasses everything that has to do with half-breed people, hapas, mixed people, "eurasian" etc.??

How good derivations are there for the viscosity term \nu \nabla^2 u_i, that contributes to the acceleration of fluid, in Navier-Stokes equations? I can see that this term is intuitively reasonable. If I wanted to approximate the velocity of the fluid in an environment of some point...

Write the nth term for the following sequence:

Homework Statement Due to the modification of inner-shell electrons of a multi-electron system, the outer shell electron can feel an effective electrostatic potential as V(r)=-e^2/(4*π*eo*R)-lambda*(e^2/(4*π*eo*R^2)) ; 0<lambda≤1 Find the energy eigenvalues and wavefunctions of the...

In another thread, alec_tronn posted My basic reaction: Write a term paper for a calc 3 class?? My first and continued impression is that this requirement is just shovel work. It hinders rather than aids mathematical education. The time taken to write the paper is time not taken to learn...

What is the light that you are seeing when you look at a crescent moon but you can still see the dark side faintly? thanks

Hi All, I have often heard the term 'non-dimensionalising', and am unsure as to what it really means. I gather that it literally means non dimensionalising the units such that it may be applied to a wider range of situations. My question is, if i have a general linear equation and wish to non...

Can some1 tell me r there any short term courses available on aerodynamics or can anybody refer me a good book...

How does the second term in a quadratic, bx, affect the graph?

Homework Statement This is starting to get a bit trick because of mixed information. Anyways, does anyone know the effects of osteoporosis in terms of short term versus long term? Homework Equations N/A The Attempt at a Solution Spine fractures caused by osteoporosis are likely...

Homework Statement What is the coeff of x^{99} in (x-1)(x-2)...(x-100) 2. The attempt at a solution This has to do with the binomial coeff. I don't know how to go about it.

Origin of the term "sine" It is well-known that "sine" comes from the Latin word "sinus", meaning a "fold", or a pocket. However, its reference to the length of the half-chord on the unit circle remains still rather obscure. I recently came over an explanation that makes perfect sense...

this is just a general trig question: We are going over Malus law in physics; the formula is this: S = s*cos^2(theta) My question is about the cosine squared term in the equation. does this simply mean take the cosine of a number and square it? in other words would this be the same thing...

Homework Statement Compute the limit a_n=n^(1/n) without using the fact that lim log a_n=log lim a_n. Instead, we're expected to solve this using binomial theorem and the error term. Homework Equations na The Attempt at a Solution Well, the error term = |a_n - L| which is...

Could somebody please give me a definition for the term gauge symmetry in contrast to any other symmetry? Is the decisive difference that a gauge symmetry is local i.e. a function of the coordinates in contrast to being constant? I would also appreciate it if it could be pointed out how the...

Hello everyone, my question is regarding the source term in ODE and PDE. If the region where the phenomenon (wave field, temperature,...) is observed is circumscribed to a volume not containing its source, then the differential equation becomes homogeneous (no source term) and easier. So...

What is the next term in this sequence? E1 O2 E3 R4 E5 X6 N7 T8 ___

question - if the 3rd and 9th term of a geometric series with a positive common ratio are -3 and -192 respectively, determine the value fo the first term, a. I kno we using a_n=a_1r^n-1 From that i got this : -3 = a_1r^2 -192 = a_1r^8 But I don't kno how I can solve for r or...

Hello everyone, I'm trying to solve the following: If n is an integer and n > = 1, find a formula for the expression 2^n - 2^{n-1} + 2^{n-2} - 2^{n-3} + ... + (-1)^{n-1} * 2 + (-1)^n okay this confuses me, because I'm not sure which is the first term and which is the last term... I...

Time dependent perturbation theory... second order term... For some reason they replace <E_{n}|H_{0}^2|E_{m}> with \Sigma<E_{n}|H_{0}|E_{i}><E_{i}|H_{0}|E_{m}> I know why they are allowed to do this, what I don't understand is how it makes my life better?

what the term "virtual particles" referred to I wanted to know what the term "virtual particles" referred to. I found many "descriptions" of them on webpages. Fine. Then I went to the index of many advanced QM books, and the term "virtual" doesn't really show up as prominently as I thought...

If you can derive the Eisntein equations from: L=\int_{V} d^{4}x\sqrt (-g)R but does L has a potential term so we can do Qm with it?..:confused: :confused:

do you have an explanation to why sometimes the general term formula for geometric sequence is not raised to n-1 but to simply n?

I need to prove that the uncertainty principle can be expressed in the form delta L * delta theta = hbar/2 where delta L is the uncertainty of the angular momentum and delta theta is the uncertainty in angular position. I know that L = m*v*r and I think I can express theta as x/r...

Hi can someone help me find a derivation of the error/remainder term for simpson's rule? None of the 3 math reference textbooks I have at home contain it.

How do we call such relation between mappings f:A->A and g:B->B when there exists one-to-one mapping h:A->B such that for any a from A f(a)=g(h(a))? Example. f: {T, F) -> {T, F} where f(x) = not x g : {0, 1} -> {0, 1} where f(x)=1-x h: {T, F} -> {0, 1} where h(T)=1...

Is there a descriptive term for an angular frequency that is always equal to 2Pi, differing only by a tens multiple or division? Equivalently, is there a descriptive term for the wavelength associated with the above value. Dividing any tens multiple or division of 2Pi into the speed of light...

Name that Mathmatics term (Periodic "blank") I have no idea what the english term for it is. As a result it is more-or-less impossible to find something about it online. One can give the equation for a sine kurve simply by looking at the graph, taking values such as the amplitute, period...

What is the next term of the given sequence.. 1,4,9,61,52, 63, 94, 46, 18, 001, 121, 441, 961, 691, 522, 652, ...(?)

This is my first topic post here so be gentle. I have a problem with the meaning of life. I don't mean my life, I know that my life on its own is pretty pointless anyway. What I am talking about is the meaning of the string of lives that make the intelligent existence of our universe...

Hi guys, can anybody solve the following problem? http://putfile.com/pic.php?pic=main/8/22412435578.jpg&s=f10"

Hello, About sometime ago, I came up with the following results, which might seem useless but it is very interesting from my point of view, I'd be glad to have your comments,:smile: Thankyou. ______________________________________________________________ I’ve found that there are...

Given a sequence: 3,33,333,3333,... Find the rth term of this sequence. This sequence does not belong to Geometry Progression or Arithmetic Progression. From what I know, rth term is equals to (r-1)*10 +3. But how do I solve this problem?

Hi I've got a question about a term in a formula I've found in Mandl&Shaw's QFT book It's about equation 2.18 on page 31 L(t) = {\sum_i \delta \bf{x}_i {\cal L}_i \ ... Why is there a delta x_i when summing over all lagrangians for getting the lagrange-function for the whole...

It sounds a bit strange in English (although we have the term in Dutch), so I'm not sure whether this is a generally known/used mathematical term: 'primitivable'. If not, it just comes down to find a primitive function F of f, so that F'=f. Specifically, I'm wondering about primitive functions...

In evolution, the definition is something along the lines of: When one individual increases the fitness of another individual either directly or indirectly, at the cost of decreasing its own fitness. (many argue there is no true form of this) By the way, it is not related to symbiosis in...

I said that A\ell=A_{\textrm{new}}\ell\left(1+\frac{x}{100}\right)\implies A_{\textrm{new}}=\frac{A}{1+\frac{x}{100}}. Also, we know that R\propto\frac{\ell}{A}.. Therefore, R_{\textrm{old}}\propto\frac{\ell}{A} R_{\textrm{new}}\propto\frac{\ell\left(1+\frac{x}{100}\right)^{2}}{A}...