# Recent content by mot

1. ### Getting the voltage to drop in a battery?

Homework Statement Suppose that you have a 9.0-V battery and wish to apply a voltage of only 3.5 V. Given an unlimited supply of 1.0-Ω resistors, how could you connect them to make a “voltage divider” that produces a 3.5-V output for a 9.0-V input r=resistance of 1 resistor=1 R=Total...
2. ### Force exerted by one disc on the other in a capacitor?

Mulled this over for a little while...got it! The field strength due to one plate is half as strong as the one calculated, and then I just used F=qE as normal to get my answer. Thanks!
3. ### Force exerted by one disc on the other in a capacitor?

Homework Statement Two circular disks, each of area 4.10×10-4 m2, are situated parallel to one another. The distance between them is small compared with their radii. Both disks are uniformly charged; their charges per unit area are σ = 5.00×10-5 C/m2 for one and -σ = -5.00×10-5 C/m2 for the...
4. ### Comparing two identical pendulums?

Homework Statement Two identical simple pendulums, of length 0.25 m and period T, are mounted side-by-side. One is released from rest with an initial angular displacement of π/9 rad, and the other is started with an initial angular velocity of 0.1 rad/s at θ = 0. They are both started in...
5. ### Conservation of angular momentum in an inelastic collision?

Thanks so much guys, I got it! It seemed so obvious this morning, I guess that's why you shouldn't do physics at 2am. I was comparing it to a question I had done with a mass on a rotating disc, forgetting that the disc was still rotating about the central axis
6. ### Conservation of angular momentum in an inelastic collision?

Sorry I made a typo in the question, 0.43 should have been 0.55. I've fixed it now. (1.2 is 0.65+0.55, the "position" of the clay on the rod with respect to the end). That's what I was thinking with the moment of inertia...but doesn't adding the mr^2 take that into account? I could also do...
7. ### Conservation of angular momentum in an inelastic collision?

Homework Statement On a frictionless table, a glob of clay of mass 0.380 kg strikes a bar of mass 0.9 kg perpendicularly at a point 0.550 m from the center of the bar and sticks to it. a) a) If the bar is 1.300 m long and the clay is moving at 8.100 m/s before striking the bar, what is the...
8. ### Easy conceptual energy problem?

That was it! It makes sense too. The "deceleration" from E to F should be less than D to E, but it could still be slowing relative to the speed before D, or it could be speeding up depending on the angle. Thanks! :)
9. ### Easy conceptual energy problem?

"Easy" conceptual energy problem? Homework Statement Here's the diagram http://nkkkjkjjjjjjjjjjj.tumblr.com/image/65137695911 A bead slides on a wire, which is in a vertical plane, as shown in the diagram. Gravity acts in the -y direction. The bead starts at A, moving to the right with an...