MI of a ring is mr^2.If we treat rings as elementsof a disc as well as of a hemisphere,then MI of a disc and of hemisphere should be same(becoz mass as well as perp. distance of every correspondingring in both from the axiswill be same,but actually not. What is wrong in the concept?(here axis is the axis passing through centre and perp. to plane in both cases)
neeru . , 14 Years ago
Grade 11