A Spinning Ice Skater Is Able to Control the Rate

Multiple Choice

A spinning ice skater 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 almost constant.
B) Her moment of inertia remains almost constant.
C) Her kinetic energy remains almost constant.
D) She is subject to a constant non-zero torque.