Question

A playground merry-go-round has a radius of R = 4.0m and has a moment of inertia I, = 7.0 x 103 kg·m2 about an axis passing through the center of mass. There is negligible friction about its vertical axis. Two children each of mass m 25kg are standing on opposite sides a distance r 3.0m from the central axis. The merry-go-round is initially at rest. A person on the ground applies a constant tangential force of F 2.5x10 N at the rim of the merry-go-round for a time A1-1.0× 10s. a) What is the magnitude of angular acceleration of the merry-go-round? b) What is the angular speed of the merry-go-round when the person stops applying force? c) What is the rotational kinetic energy of the merry-go-round when the person stopped applying the force?

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-6295、25 J

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