Question

The figure shows an overhead view of a ring that can rotate
about its center like a merry-go-round. Its outer radius
*R*_{2} is 1.0 m, its inner radius
*R*_{1} is *R*_{2}/2, its mass
*M* is 7.9 kg, and the mass of the crossbars at its center
is negligible. It initially rotates at an angular speed of 7.3
rad/s with a cat of mass *m = M*/4 on its outer edge, at
radius *R*_{2}. By how much does the cat increase
the kinetic energy of the cat-ring system if the cat crawls to the
inner edge, at radius *R*_{1}?

Answer #1

The figure shows an overhead view of a ring that can rotate
about its center like a merry-go-round. Its outer radius R2 is 0.9
m, its inner radius R1 is R2/2, its mass M is 8.0 kg, and the mass
of the crossbars at its center is negligible. It initially rotates
at an angular speed of 8.5 rad/s with a cat of mass m = M/4 on its
outer edge, at radius R2. By how much does the cat increase...

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