An ice skater has a moment of inertia of 5.0 kg-m^2 when her arms are outstretched....
An ice skater has a moment of inertia of 5.0 kg-m2 when her arms are outstretched. At this time she is spinning at 3.0 revolutions per second (rps). If she pulls in her arms and decreases her moment of inertia to 2.0 kg-m2, how fast will she be spinning?
A) 7.5 rps
B) 8.4 rps
C) 2.0 rps
D) 10 rps
E) 3.3 rps
Homework Answers
Conservation of angular momentum
Since no external torque is acting
I1w1 = I2w2
5.0*3 = 2.0 w2
w2 = 7.5 rps
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