Moment inertia -- theoretical problem 1. The problem statement, all variables and given/known data Show that the moment inertia of a hollow cylinder with inner radius a and outer radius b is (1/2)*M*(a^2+b^2), calculated for the center axis. 2. Relevant equations I know that the moment inertia of a non-hollow cylinder is I = (1/2) MR^2, but I don't know the moment inertia of a hollow one. I = MR^2, generally. Krotation = (1/2)Iw^2 3. The attempt at a solution I'm not entirely certain on where to start. Should I split the cylinder into two parts and work from there?