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  3. a ballerina spins initially at 1.5 rev/s when her

A ballerina spins initially at 1.5 rev/s when her arms are extended. She then draws...

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A ballerina spins initially at 1.5 rev/s when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg m, and her angular speed increases to 4.0 rev/s. What was her initial moment of inertia?

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