Question

A merry-go-round has a radius of 3.12m and a moment of inertia
of 2800kg m^{2} about the vertical axis through the center.
It hsd wd40 so it turns without friction. A child applied a
tangential force of 14 N for 13 s. The merry-go-round starts at
rest.

What is the work done by the child during the 13s?

Answer #1

A playground merry-go-round has radius 2.40m and moment of
inertia 2100kg?m2 about a vertical axle through its center, and it
turns with negligible friction.
A child applies an 22.5N force tangentially to the edge of the
merry-go-round for 19.0s . If the merry-go-round is initially at
rest, what is its angular speed after this 19.0s interval?
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