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## Homework Statement

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?

## Homework Equations

I=MR²

(sphere) I=(2/5)MR²

## 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