Asked by Joe

A playground merry go round has a mass of 125kg and radius of 1.6m is rotating with a frequency of 0.42 rev/s. What is the magnitude of its angular velocity in radians per second after a 25kg child gets onto in be grabbing by its edge? The child is initially at rest.
Answered by scott
angular momentum is conserved

initial ang. mom. of ride = final ang. mom. of ride + ang. mom. of child
Answered by Joe
where did mom came from
Answered by bobpursley
AngularMomentumInitial=AngularMomentumFinal+AngularMomentumChild

No Moms involved.
Answered by Joe
since L=Iw, I=aMR^2, and a for disk(merry go round) a=1/2 and hoop(how child is moving on the merry go round) a=1
0.42rev/s =2.638937829 rad/s

I've tried
1/2(125)(1.6^2)(2.638937829)=1(125+25)(1.6^2)w
w=1.099
but the answer came out wrong
Answered by bobpursley
The child is not a hoop. The child is a point mass. I= m r^2
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