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• Users: cp51
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1. ### Charge inside Grounded Cube

Homework Statement There's a charge, not at the center of a grounded cube. Find the potential in the cube. Homework Equations The Attempt at a Solution I'm really just looking for a place to start. I should end up with some kind of series, but I don't know if I should be doing...
2. ### Torque on Pulley sitting on moving belt

Homework Statement There is a Pulley (or just a wheel) sitting on a moving belt being pulled with force Fa with some unknown friction between the pulley and the belt. The pulley rotates without slipping on the belt. Draw a freebody diagram of the pulley and the belt. Homework Equations...
3. ### Possible values and their Probability of Measuring S^2 - Spin

Ok, I think I got it, so using: e1 = \frac{1}{\sqrt{2}}(|+,-> + |-,+>) with eigenvalue 2hbar^2 and e2 = \frac{1}{\sqrt{2}}(|+,-> - |-,+>) with eigenvalue 0 I rewrite: |+,-> as (e1 + e2)*(sqrt(2)/2) and |-,+> as (e1 - e2)*(sqrt(2)/2) Combine e1 and e2 terms. And then the...
4. ### Possible values and their Probability of Measuring S^2 - Spin

Hmm, I'm not positive... is that writing it in |10> and |00> states? I am not exactly sure how to do this. Can you help get me moving in the right direction? thanks for the help.
5. ### Possible values and their Probability of Measuring S^2 - Spin

Homework Statement I have a two spin 1/2 particles. The Hamiltonian for the system is given as H = w1 S1z + w2 S2z. I need to find the possible values and their probabilities when I measure S^2 at some later time T. Also the Initial state \Psi (0) = a | \uparrow \downarrow > + b | \downarrow...
6. ### Multiplicity of s-dimensional Harmonic oscillator

Homework Statement The energy eigenvalues of an s-dimensional harmonic oscillator is: \epsilon_j = (j+\frac{s}{2})\hbar\omega show that the jth energy level has multiplicity \frac{(j + s - 1)!}{j!(s - 1)!} Homework Equations partition function: Z = \Sigma e^{-(...
7. ### Engineering RC Circuit capacitor charge Help

omg, I am so dumb... i totally didnt think of it that way... Thanks. I started to look at it as charge and stuff, and I kinda thought i figured it out, but man... Thanks a lot.
8. ### Engineering RC Circuit capacitor charge Help

ok, I am still not getting why when the switch is open, the circuit simplifies to a circuit without resistors...
9. ### Engineering RC Circuit capacitor charge Help

well, as I understand it: Once C1 and C2 are fully charged no current flows through the two branches because the capacitors act as an open circuit. So that would mean that the current through the reisitors is 0 and therefore no voltage drop. However, because the two capacitors are now...
10. ### Comp Sci Java project calculation

its been a while since i did ne java, but if u just put: public void actionPerformed(ActionEvent evt) { getInput(); calculateShipping(); displayOutput(); } Just adding it before u call displayOutput should calculate the shipping, then u can...
11. ### Engineering RC Circuit capacitor charge Help

[SOLVED] RC Circuit Help Homework Statement What is the potential of point a with respect to point b in the circuit shown when switch S is open? Which point, a or b is at a higher potential? b.) What is the potential (after a long time) of point a with respect to ground when switch S is...