I am supposed to prove the moment of inertia about a spinning cone through the diameter. but I am supposed to do it using single integration and triple integration. I think I did it right in the triple integration but I really dont know what needs integrating with the single. the paper gave me my professors guess of 3/10MR^2 but when I did the triple integration it gave me 3/5 so I dont even know if I did it right. just a guiding hand would be appreciated. thanks a lot... maybe just a link to something to help with moments of inertia in general would do the trick because I have several... one of them is a sphere with varying density as the radius increases and I have no idea how that's to be done. I do appreciate the help and look forward to doing my best to contribute where I can. Adios.