Question

Moment of inertia of solid and hollow cylinder

Answer 1

a point mass m at the end of a rod of length r has this same moment of inertia and the value r is called the radius of gyration.Solid cylinder of radius r, height h and mass m. ... When the cavity radius r1 = 0, the object is a solid ball (above). When r1 = r2, , and the object is a hollow sphere.

Answer 2

The moment of inertia of a point mass with respect to an axis is defined as the product of the mass times the distance from the axis squared. The moment of inertia of any extended object is built up from that basic definition