A bowling ball made for a child has half the radius of an adult bowling ball. They are made of the same material (and therefore have the same mass per unit volume). By what factor is a) mass and b) rotational inertia if the child's ball reduced compared with the adult ball?
The Attempt at a Solution
I only got to: R(adult) = (1/2)R (child).
PS. the answers to a) reduced by a factor of 8 and b)reduced by a factor of 32