Recent content by Ned Stark

Homework Statement I need to find the momentum space wavefuntion Phi(p,t) for a particle in the first excited state of the harmonic oscillator using a raising operator. Homework Equations Phi_1(p,t)= "raising operator" * Phi_0 (p,t)The Attempt at a Solution In position space, psi_1 (x) =...

The problem says "around" the disk, so that probably means where does E not point outside of the disk. to answer, consider the electric field in regions far far away from the disk, so that the disk appears to be a point. What would the field look like?

Homework Statement A particle of mass m follows the spacetime trajectory x(τ) = (Aτ, Bτ , C cosτω, C sinτω ). What is the 4-velocity u(τ)? Why must A =sqrt[1+B^2+(ωC)^2]
Homework Equations u(τ)=dx(τ)/dτ , u^2 = -c^2 The Attempt at a Solution so I took the derivative of...

Let me give you a hint on the general theory behind this: your relevant equation seems flat bizarre first of all, why is there no 't' in x(t) and what is gama? --------- to set you in the direction i would go: you have your driving force F F=-d/dx(V(x) then V(x) =...

P*V=n*R*T from question; P don't change, and there is a finite amount of gas in chamber (i.e. n don't change) so P don't change, n don't change (and R is a const. so it don't change), then what else could change (hint. if T change, then V change)

actually It doesn't seem to funky now that I've thought about it some more. the important thing is that is bobs inertial frame, the speed of light relative to him is c

Is it correct to say that in andrews frame, the relative velocity between the flash and bob is c+v? That seems kinda funky. But i do get what your saying about relativity of simultinaity. I drew a Minkowski diagram for bobs frame, and sure enough, in bobs frame the lamp does not flash at...

Homework Statement Andrew is at rest in frame S and observes Bob moving to the right (frame S0 is bobs rest frame) with speed v. On the ground, a distance L to the right of Andrew, is a lamp. At the instant that bob passes Andrew (as observed in frame S), the lamp emits a flash of light...

Homework Statement a light, inextensible string passes over a small pulley and carries a mass of 2m on one end. on the other end is a mass m, and beneath it, supported by a spring w/ spring constant k, is a second mass m. using the distance x, of the first mass beneath the pulley, and the...