A skater can spin faster by pulling her arms closer to her body or spin slower by spreading her arms out from her body.This is due to
A)the law of gravity.
B)Newton's third law.
C)conservation of momentum.
D)conservation of angular momentum.
E)conservation of energy.

Question

Quizplus · Accepted Answer

When a skater spins, they have angular momentum which is conserved, meaning the rate of spin cannot change unless an external force is applied. When the skater pulls their arms in, they decrease their moment of inertia, which means their angular velocity must increase to conserve angular momentum. Conversely, when they spread their arms out, they increase their moment of inertia, meaning their angular velocity must decrease to conserve angular momentum. This phenomenon is described by conservation of angular momentum.

A Skater Can Spin Faster by Pulling Her Arms Closer