Question

(a) What is radius of gyration?
(b) What will happen if center of mass coincides with axis of rotation?
(c) What will be the value of moment of inertia in case (b) ?

Answer 1

(a). Radius of gyration is defined as the distance from the axis of rotation to the point where the total mass of the body is supposed to be concentrated, so that the moment of inertia about axis may remain the same. simply gyration is the distribution of the components of an object.

Answer 2

B. If centre of mass coincides with the axis of rotation,

Rotational KE= 1/2 Icm w^2,

Where Icm = moment of inertia about the axis passing through the centre of mass.