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.

Thx

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Conservation of Angular Momentum Question

**Physics Forums | Science Articles, Homework Help, Discussion**