A Spinning Ice Skater on Extremely Smooth Ice Is Able

Multiple Choice

A spinning ice skater on extremely smooth ice is able to control the rate at which she rotates by pulling in her arms.Which of the following statements are true about the skater during this process? (There could be more than one correct choice. )

A) Her angular momentum remains constant.
B) Her moment of inertia remains constant.
C) Her kinetic energy remains constant.
D) She is subject to a constant non-zero torque.