You stand on a frictional platform that is rotating at 14, Physics

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You stand on a frictional platform that is rotating at 14

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?

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