A person stands hands at his side, on platform that is rotating at a rate of 1.30

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A person stands hands at his side, on platform that is rotating at a rate of 1.30 rev/s. If he raises his arms to a horizontal position Fig. 8-48, the speed of rotation decreases to 0.80 rev/s.
(a) Why?
(b) By what factor has his moment of inertia changed?


A person stands hands at his side, on platform that
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