The 80-kg man is holding two dumbbells while standing on a turntable of neglibib

Question

The 80-kg man is holding two dumbbells while standing on a turntable of neglibible mass, which turns freely about a vertical axis. When his arms are fully extended, the turntable is rotating with an angular velocity of 0.5 rev/s. Determine the angular velocity of the man when he retracts his arms to the the position shown. When his arms are fully extended, approximate each arm as a uniform 6-kg rod having a length of 650mm, and his body as a 68-kg solid cylinder of 400-mm diameter. With his arms in the retracted position, assume the man is an 80-kg solid cylinder of 450mm diameter. Each dumbbell consists of two 5-kg spheres of negligible size.

Explanation / Answer

The 80-kg man is holding two dumbbells while standing on a turntable of neglibib

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