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(a) A student rotates on a frictionless piano stool with his arms outstretched, a heavy weight in each hand. Suddenly he lets go of the weights, and they fall to the floor. As a result, does the student s angular speed increase, decrease, or stay the same?
(b) Choose the best explanation from among the following:
I. The loss of angular momentum when the weights are dropped causes the student to rotate more slowly.
II. The student s moment of inertia is decreased by dropping the weights.
III. Dropping the weights exerts no torque on the student, but the floor exerts a torque on the weights when they land. |
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