Rotational Motion Question 9
Question: 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?
[AIEEE 2004]
Options:
A) Moment of inertia
B) Angular momentum
C) Angular velocity
D) Rotational kinetic energy
Show Answer
Answer:
Correct Answer: B
Solution:
- [b] In free space, neither acceleration due to gravity nor external torque act on the rotating solid sphere.
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.
