Ice skater angular momentum conservation · CAP 2013 #21

Physics · mechanics

Problem

A spinning ice skater has an initial kinetic energy

\frac{1}{2}I\omega^2

. She pulls in her outstretched arms, decreasing her moment of inertia to

\frac{1}{4}I

. What is her new angular speed? a) ω/4 b) ω/2 c) ω d) 2ω e) 4ω