First slide

Law of conservation of angular momentum

Question

A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?

Easy

A

Angular velocity
B

Moment of inertia
C

Rotational kinetic energy
D

Angular momentum

Solution

As there is no external torque acting on a sphere, i.e., $τ_{e x} = 0$
$So, \frac{d L}{d t} = τ_{e x} = 0 i.e., L = constant$
So angular momentum remains constant.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App