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physics

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A 44.8- child is standing on the outer edge of a merry-go-round 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 merry-go-round.

  • physics - ,

    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...

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