physics
posted by Anonymous on .
A 44.8 child is standing on the outer edge of a merrygoround that has moment of inertia 981 and radius 2.40 . The entire system is initially rotating at 0.180 . Find the angular velocity if the child moves to a final position 1.10 from the center of the merrygoround.

It can't be answered very well without units given.
conservation of momentum
Ii*wi=(If)*Wf
where If=Ii+masskid*r^2
initiall, the moment of inertia for the child is zero, because r=0
watch units on angular rotation initial...