Question

A tennis ball has a mass of 68 g and a diameter of 6.4 cm. find the moment of inertia about its diameter.

Answer 1

assumed that the tennis ball is a solid sphere, the moment of inertia of the ball= 2/5 M R^2

R= 6.4/2 = 3.2 cm
M= 68 g
I = 278.53 g cm^2