An ice skater starts a spin with her arms stretched out to the sides. She balances on the tip of one skate to turn without friction. She then pulls her arms in so that her moment of inertia decreases by a factor of 2. In the process of her doing so, what happens to her kinetic energy?

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

It increases by a factor of 4.

It increases by a factor of 2.

It remains constant.

It decreases by a factor of 2.

answer is B.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Angular momentum is conserved.KE of rotation in term of angular momentum is given byKE=L22I.Since I is halved , KE becomes doubled..

Watch 3-min video & get full concept clarity