- #1

- 590

- 0

However, I had some trouble with the MOI of a solid sphere about an axis through its centre. The problem being that my final answer was markedly different from the original expression ie 2/5MR^2 ,if my memory is correct.

My answer ( it contained terms like pi) was somewhat close to the original answer but not close enough (at least for me).

So is the original expression just an approximation or do I have to recheck my work ?

Also can someone tell me what assumptions are to be made when calculating the MOI of a " thin rod " ?