A ballerina spins initially at 15 revolutionssecond when, Ask an Expert

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A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg-m2 and her angular speed increases to 4.0 rev/s. Determine her initial moment of inertia.

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