The 80 kg man is holding 2 dumbbells while standing on a turntable of negligible

Question

The 80 kg man is holding 2 dumbbells while standing on a turntable of negligible 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 position shown. When his arms are fully extended, approximate each arm as a uniform 6 kg rod having a length of 650 mm, and his body as a 68 kg solid cylinder of 400 mm diameter. Each dumbbell consists of two 5 kg spheres of negligible size. Problem 19-33, from Hibbeler Dynamics, Edition 13

Explanation / Answer

The 80 kg man is holding 2 dumbbells while standing on a turntable of negligible

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