Question

An ice skater, has a rotational inertia of I = 4 kg m2, and spins at 2 rad/sec. She then changes her rotational inertia to 2 kg m2. What is her final angular velocity?

a. 4 rad/s
b. 2 rad/s
c. 2.8 rad/s
d. 8 rad/s

I say B, am i right?

Answer 1

No, of course not. Angular momentum is conserved. You reduced the moment of interia (rotational inertia is a really bad term), so angular velocity has to change.

Answer 2

so its A then right