1. Derive the moment of inertia of a sphere with thick walls. 2. Relevant equations I=(.5)(M)(R^2+R^2) ? one is for the inner radius the other is for the outer radius. 3. The attempt at a solution I believe this can be found by integrating a series of infinitely thin cylinders with different size holes, but I am only have a high school physics knowledge. Answer: I=(2/5)(R^5-R^5)(R^3-R^3) Is there an name for this equation? Is there any website detailing the steps to deriving the moment of inertia of this object without Calculus III? with Calculus III? Thanks for any help.