A hoop of mass 500 g and radius 10 cm is placed on a nail. Find the moment of inertia of the hoop when it is rotated about the nail.

Explanation

When the hoop is rotated about the nail, the axis of rotation is the tangent perpendicular to its plane. Its moment of inertia
`I=2MR^(2)=2xx0.5xx(0.1)^(2)=0.01kgm^(2)`