An ice skater doing a toe spin with outstretched arms has an angular velocity of 4 rad/s. She then tucks in her arms, decreasing her moment of inertia by 7.5%(adsbygoogle = window.adsbygoogle || []).push({});

a. What is the resulting angular velocity?

b. By what factor does the skater's kinetic energy change?

For a, I use IW = I'W' >> 1(4rad/s) = (1-.075)W', then solve for W'

I got 4.32 rad/s for W'. I don't know if I'm doing it correctly. Also, I need help on part b.

For part b I got .925. Is that correct?

Thanks

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# Angular Momentum of an ice skater

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