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    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...
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    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...
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    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...
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    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...
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    Easy conceptual energy problem?

    "Easy" conceptual energy problem? Homework Statement Here's the diagram 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...