When a woman on a frictionless rotating turntable extends her arms out horizontally, her angular momentum:
A)must increase
B)must decrease
C)must remain the same
D)may increase or decrease depending on her initial angular velocity
E)tilts away from the vertical

Question

Quizplus · Accepted Answer

Angular momentum is conserved in a closed system without external torques, so when the woman extends her arms, her moment of inertia increases, but her angular momentum remains constant.

When a Woman on a Frictionless Rotating Turntable Extends Her