Question

Moment of inertia of solid sphere is greater than hollow sphere

Answer 1

It isn’t necessarily, depending on the masses and OD. (s = solid, o = Christmas ornament).

If Ro = Rs, the moments of inertia are the same if:

2/5 Ms = 2/3 Mo; so if if Ms < 5/3 Mo, then the solid sphere will have a smaller moment of inertia than the hollow sphere of the same size.

Answer 2

$\textbf{Answer is in attachment!}$