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)2.0 rps B)3.3 rps C)7.5 rps D)8.4 rps E)10 rps

Question

Quizplus · Accepted Answer

The conservation of angular momentum states that the initial angular momentum equals the final angular momentum. Initial angular momentum = 5.0 kg∙m² * 3.0 rps. Final angular momentum = 2.0 kg∙m² * final rps. Solving for final rps gives 7.5 rps.

An Ice Skater Has a Moment of Inertia of 5