Question: What is the moment of inertia of a solid cylinder about its central axis?

Options:

1. 1/2 m r^2
2. 1/3 m r^2
3. m r^2
4. m r^2 / 2

Correct Answer: 1/2 m r^2

Solution:

The moment of inertia of a solid cylinder about its central axis is given by I = 1/2 m r^2.