Question: A person stands, hands at his side, on a platform that is rotating at a rate of 0.90 rev/s. If he raises his arms to

A person stands, hands at his side, on a platform that is rotating at a rate of 0.90 rev/s. If he raises his arms to a horizontal position, Fig. 8-55, the speed of rotation decreases to 0.60rev/s.

(a) Why?

(b) By what factor has his moment of inertia changed?

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