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April 19, 2014

April 19, 2014

Posted by **ashely** on Saturday, February 11, 2012 at 10:19am.

- physics -
**drwls**, Saturday, February 11, 2012 at 12:18pmBecause angular momentum is conserved,

I*w = (Moment of intertia)*(angular speed) remains constant

Therefore

1.72*(15 rad/s)= 0.061*(final angular speed)

Final angular speed = 15*1.72/0.061

= 423 rad/s

Kinetic energy = (1/2)*I*w^2

increases by the same (w2/w1) factor, sinc I*w is constant.

The added kinetic energy comes from work done by the skater pulling in her arms and free leg.

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