the moment of inertia of a solid cylinder about an axis passing through its COM and parallel to its length is mr2/2 where r is the radius.

mass moment of inertia for a solid sphere:

I = (2 /5) * mass * radius2

(mass in kg, radius in metres)

2/5 mr2

Moment of inertia depends upon the distribution of mass with respect to the axis of rotation.The greater the distance between the bulk of an object's mass and the axis of rotation, the greater the moment of inertia will be. A solid disk has its mass distributed evenly across its diameter, while a ring has its mass concentrated furthest from the centre of rotation.

How do to determine the moment of inertia of a cub