Question

18. The moment of inertia (MI) of a rotating body with unit angular velocity is equal to
(A) 2 x K.E. of rotation
(B) K.E. of rotation
(C) K.E. of rotation
(D) 4 × K.E. of rotation​

Answer 1

Option c is correct.

• The moment of inertia (MI) of a rotating body with unit angular velocity is equal to​ I = mr^2
• The moment of inertia for a rotating body is the measure of its rotational inertia.
• If the moment of inertia of a rotating body is greater then its resistance would be higher and there will be a significant change in the angular velocity.
• Similarly, the kinetic energy associated with a rigid body rotating around an axis is given as K = 1/2 Iω^2