Question

What is radius of gyration

Answer 1

Radius of gyration or gyradius of a body about an axis of rotation is defined as the radial distance of a point from the axis of rotation at which, if whole mass of the body is assumed to be concentrated, its moment of inertia about the given axis would be the same as with its actual distribution of mass

Answer 2

Radius of gyration of a body about an axis is the effective distance from the axis where whole mass of the body is assumed to be concentrated ..... such that the MOI remains constant