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A famous demonstration of rotational motion consists of a hollow sphere that can expand/contract. The mass of the sphere is 0.5 kg. Initially, the sphere

A famous demonstration of rotational motion consists of a hollow sphere that can expand/contract. The mass of the sphere is 0.5 kg. Initially, the sphere is fully expanded and has a radius of 0.5 m and rotates at a rate of 6.28 rad/s. It then contracts to a radius of 0.1 m. How fast is it rotating after the collapse?

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