### Possible Answer

Now imagine this hollow sphere (with no wall ... the radius of gyration 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 the whole mass of the body is assumed to be concentrated,its moment of inertia about ... - read more

Also, 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 ... Sphere (hollow) of radius r and mass m. A hollow sphere can be taken to be made up of two stacks of infinitesimally thin, circular hoops, ... - read more

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