The moment of inertia of a dancer is 7. 0 𝑘𝑔 𝑚 when she performs 48 rotations per minute with both arms outstretched. The moment of inertia reduces to 2. 2 𝑘𝑔 𝑚 when she wraps her arms around her body. Calculate the new number of rotations per second
To calculate the new number of rotations per second, apply conservation of angular momentum:
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