1. The problem statement, all variables and given/known data how to devide moment of inertia of solid sphere about its central axis?. Solid sphere has radius R, mass M. 2. Relevant equations I=∫r2dm 2/5 MR^2 3. The attempt at a solution https://photos.google.com/search/_tra_/photo/AF1QipPoXyad0q1Y3yisc0LeeJHGApkIrGbitK6kAk5p i try to imagine that solid sphere is a group of infinite disk. a disk have volume dv=πr2dx. dm=ρdv=πρr2dx. I=R∫-Rr2πρr2dx I=πρR∫-Rr4dx I=πρR∫-R(R2-x2)2dx I=πρR∫-RR4-2R2x2+x4dx I=πρ[2R5-4/3R5+2/5R5] !=πρR5[30-20+6]/15 I=16/15 πρR5 I=4/5 (4/3πρR3)R2 I=4/5MR2 where my eror? i have spent 2 days to solve it but i am failed until now.