Recent content by breez

There are two insulated compartments separated by a thin wall. The left side contains .060 mol of He at a initial temperature of 600 k and the right side contains .030 mol He at the initial temperature of 300 K. The compartment on the right is attached to a vertical cylinder, above which the...

Hey, while reading Kleppner & Kolenkow's discourse on gyrocompasses, I ran into a statement I could not wrap my head around: "The pivots at A and B allow the system to swing freely about the y axis, so there can be no torque along the y-axis." AB is an axis along the y-axis, which is the...

It can be shown that if F has continuous 2nd partials, then div curl F = 0. According to Stoke's Theorem, the work done around a closed path C is equal to the flux integral of curl F on a surface sigma that has C as its boundary in positive orientation. However, this integral is equal to the...

In the problem, 3 blocks are connected by massless strings, and another string pulls the rightmost block on a frictionless surface. You have to find the tension in the smaller strings in terms of the block masses, tension in the rightmost string, and the uniform acceleration.

Say you have 2 masses connected by a massless string, and another massless string is connected to the rightmost mass. A tension force T acts along this rightmost string, resulting in the string connecting the 2 masses to become taunt. In these cases, you can treat the 2 masses as one mass...

Oh thanks. Are these 2 capacitors in series or parallel? I think they should be in series right? EDIT: Actually after solving this problem the capacitors end up with different charges and different voltages I find they are in fact parallel... I guess as long as 2 capacitors are in a closed...

The exact question asks: a. What is the charge on the 4 microF capacitor after switch 2 is closed for 1 minute? b. What is the final charge on the 2 capacitors?

Yeah that's a typo in the book. It should be 20MV.

http://img230.imageshack.us/img230/8480/circuitbb5.th.gif Switch 1 is turned on until the 12 microF capacitor is completely charged. Then Switch 1 is switched off, while switch 2 is switched on. How do you write a differential equation that may be used to find charge on the 4 mircroF...

It would just be v/6. I really have no idea where to go on this one...

I understand that, but I stated I used Conservation of Energy AFTER the collision. Energy is conserved after the inelastic collision.

A mass M is attached to the left end of a spring with a spring constant K and a mass 4M is attached to the right end. A third mass of mass M slides with velocity v and hits mass M in a completely inelastic collision. What is the velocity of the smaller mass and of the larger mass when the...

Oh I see, I got 36 J. You can skip the integration using equivalent resistance to find the current in the middle branch, then do U = LI^2/2. This gives 36 J. Since the final current is 0, the energy must all be dissipated.

http://img527.imageshack.us/img527/1787/lccircuitrk6.th.gif The switch S is closed for a long time and then released again. How much energy is dissipated through the resistors after the switch is released? It should be (LI^2)/2 shouldn't it? Where I is the current right before the...

but it looks that they don't share a common out? The top 10 ohm resistor has a split in its path.