A figure skater is spinning on nearly friction-free ice with arms fully extended
PHYSICS · Single correct · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
A figure skater is spinning on nearly friction-free ice with arms fully extended. She then pulls her arms inward so that her rotational inertia decreases to one-half of its original value. No external torques act on the system. Which statement best describes her subsequent motion?
(a) Her angular momentum doubles and her angular speed is halved.
(b) Both her angular momentum and her angular speed remain unchanged.
(c) Her angular momentum remains the same and her angular speed doubles.
(d) Her angular momentum remains the same and her angular speed is halved.