# Physics

posted by tiffany

A 3.6 m diameter merry-go-round is rotating freely with an angular velocity of 0.78 rad/s. Its total moment of inertia is 1700 kg m^2. Four people standing on the ground, each of mass 62 kg, suddenly step onto the edge of the merry-go-round.

What is the angular velocity of the merry-go-round now?

What if the people were on it initially and then jumped off in a radial direction (relative to the merry-go-round)?

1. bobpursley

When they step on, the I increases by 4*62*1.8^2 (mr^2)

so, wnew=wold* Iold/Inew

In the second case, Inew would be decreased, ..

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