Recent content by pkossak

I was wondering about the following problem: You are looking down on a single coil in a constant magnetic field B = 0.9 T which points directly into of the screen. The dimensions of the coil go from a = 6 cm and b = 15 cm, to a* = 20 cm and b* = 19 cm in t=0.028 seconds. If the coil has...

sorry I just realized this was the wrong place to post this question!

I was wondering about the following problem: You are looking down on a single coil in a constant magnetic field B = 0.9 T which points directly into of the screen. The dimensions of the coil go from a = 6 cm and b = 15 cm, to a* = 20 cm and b* = 19 cm in t=0.028 seconds. If the coil has...

Two wires support a beam of length L=20 m and mass 330 kg as shown in the figure above. A box of mass 220 kg hangs from a wire which hangs from the beam a distance x=15 m away from the left edge of the beam. What is the tension in the RIGHT support wire? (in N) I just did an (at least I...

Thank you! I don't see why the way I was doing it doesn't produce the same answer, but it's definitely working right now. Thanks a ton.

And wouldn't the potential energy at the Earth's surface be 0?

I don't mean to keep begging, but if anyone could take a look and tell me if they see anything I'm missing i am really appreciative. My final is tomorrow.

I agree...shouldn't g be constant? I don't see how can I use 9.81 m/s^2 in this situation, and I still have to determine g regardless. You guys are helping me understand it a lot, but I'm at a standstill with how to determine F, let alone r

And I don't know of an equation I can use for all that without having to use acceleration. for the Vav = .5(v +vo), I don't see how I could I plug in 333 and come out with 666, as 333 would be v, and 0 would be vo. I can't use x = xo + vo*t + .5*a*t^2 because I don't know acceleration...

A rock is dropped from outer space (initial velocity=0) at a radius R from Earth's center. It is recorded moving at a speed 8368 m/s when it strikes the surface of the Earth. What was R? (in m) (Ignore the air resistance felt during the last few miles of the approach to the planet) R Earth =...

i was using x = xo + Vav*t

I feel like I'm losing my mind asking such an easy question, but for some reason I can't think of why the answer is double of what I'm calculating every time for this question. After landing, a jet airplane comes to rest uniformly (the acceleration is constant) in 11.5 seconds. The aircraft...

Thank you very much. I think I followed what you said pretty well, but for some reason my answer is about 1 or 2 C off. What did I do wrong? Thanks a lot. (2220 J/kgC*0.05 kg*(0 + 20 C)) = -(4186 J/kgC*0.25 kg*(Tf - 25 C)) Tf = 24.03 C (4186 J/kgC*0.05*(Tf - 0)) + (333 J/g*50 g) =...

Anyone? thanks

great explanation