Q. A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected?
A) Moment of inertia
B) Angular momentum
C) Angular velocity
D) Rotational kinetic energy
Explanation
(b) In free space neither acceleration due to gravity nor external torque act on the rotating solid space. Therefore, taking the same mass of sphere if radius is increased then moment of inertia, rotational kinetic energy and angular velocity will change but according to law of conservation of momentum, angular momentum will not change.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.