A spinning figure skater pulls his arms in as he rotates on the ice as he pulls his arms in. What happens to his angular momentum L and kinetic energy Ek?

Solution

VerifiedThe angular momentum of an object depends on the moment of inertia and its angular velocity. So, what matters to us is the mass distribution in relation to the object's center of mass. The closer the total mass of the body is to the center of mass, the angular velocity of the body increases.

Kinetic energy depends on its angular velocity. The higher the speed of the body, the greater its kinetic energy.

So, this is the reason why the skater pulls his arms along his body while turning on the ice, reduces his moment of inertia, and his angular velocity increases, resulting in an increase in his kinetic energy.

## Create a free account to view solutions

## Create a free account to view solutions

## Recommended textbook solutions

#### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

4th Edition•ISBN: 9780133942651 (8 more)Randall D. Knight#### Mathematical Methods in the Physical Sciences

3rd Edition•ISBN: 9780471198260 (1 more)Mary L. Boas#### Introduction to Quantum Mechanics

3rd Edition•ISBN: 9781107189638Darrell F. Schroeter, David J. Griffiths#### Fundamentals of Physics

10th Edition•ISBN: 9781118230718 (3 more)David Halliday, Jearl Walker, Robert Resnick## More related questions

1/4

1/7