A 45 \ m kg figure skater is spinning on the toes of her skates at 1.0 \ m rev/s

Question

A 45 m kg figure skater is spinning on the toes of her skates at 1.0 m rev/s. Her arms are outstretched as far as they will go. In this orientation, the skater can be modeled as a cylindrical torso (40 m kg, 20 m cm average diameter, 160 m cm tall) plus two rod-like arms (2.5 m kg each, 66 m cm long) attached to the outside of the torso. The skater then raises her arms straight above her head, where she appears to be a 45 m kg, 20- m cm-diameter, 200- m cm-tall cylinder. What is her new rotation frequency, in revolutions per second?

Explanation / Answer

5.8 rev/sec

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