Angular Momentum: A light-weight potter's wheel, having a moment of inertia of 24 kg ? m2, is spinning freely at 40.0 rpm. The potter drops a small but dense lump of clay onto the wheel, where it sticks a distance 1.2 m from the rotational axis. If the subsequent angular speed of the wheel and clay is 32 rpm, what is the mass of the clay?
A. 4.2 kg
B. 2.8 kg
C. 3.7 kg
D. 4.6 kg
Answer: A
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Slanting Surfaces Without Friction: A 200-N sled of slides down a frictionless hillside that rises at 37° above the horizontal. What is the magnitude of the force that the surface of the hill exerts on the sled?
A. 200 N B. 120 N C. 160 N D. 150 N E. 0 N
Energy Levels: What is the energy required to remove the electron from a hydrogen atom in the n = 11 state?
A. 0.112 eV B. 1.24 eV C. 13.5 eV D. 12.4 eV E. 0.141 eV
Equilibrium: A 400-kg box is lifted vertically upward with constant velocity by means of two cables pulling at 40.0° on either side of the vertical direction. What is the tension in each cable?
A. 231 N B. 400 N C. 800 N D. 2560 N E. 3920 N
If the speed of light were infinite but the postulates of special relativity still held, then
A. time dilation would be obvious at low speeds. B. length contraction would not occur. C. objects could have negative kinetic energy. D. any moving object would have infinite momentum.