I know how to take out the moment of inertia of a sphere about an axis passing through a diameter. My method is the same old one of choosing an elemental sheet and integrating. Can someone please explain to me the things I saw on Mathworld please. The method looks fascinating to me and I wish to learn it and use it for other 3 bodies.
The original link is:The volume of the sphere, V=4/3 pi* r^3 , can be found in Cartesian, cylindrical, and spherical coordinates, respectively, using the integrals
The interior of the sphere of radius and mass has moment of inertia tensor