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 momentum
B

angular velocity
C

rotational kinetic energy
D

moment of inertia

Solution

As no external torque is acting on the sphere hence angular momentum of the sphere will be constant.

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