Question
There are two cylinders of same mass and same radius. One cylinder is solid and other is hollow. Which of them has more moment of inertia about its axis?
Solution
Hollow cylinder has more moment of inertia than the solid cylinder. This is because, for a hollow cylinder, the entire mass is at its periphery. That is, at a maximum distance from the centre. Hence, moment of inertia is less for a solid cylinder.
