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You stand on a frictional platform that is rotating at 1.4 rev/s. Your arms are outstretched, and youhold a heavy weight in each hand. The moment of inertia of you, theextended weights, and the platform is 8.6 kg · m2. When you pull theweights in toward your body, the moment of inertia decreases to4.4 kg · m2.
(a) What is the resulting angular speed of theplatform?
(b) What is the change in kinetic energy of the system?
(c) Where did this increase in energy comefrom?
An apparatus that liquefies helium is in a room maintained at 306 K. If the helium in the apparatus is at 4.0 K, what is the minimum ratio Qto/Qfrom, where Qto is the energy delivered as heat to the room and Qfrom is the energy removed as heat from t..
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