A man of mass m 700 kg pushes a rotating platform of mass, Physics

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A man of mass m 700 kg pushes a rotating platform of mass

A man of mass m = 70.0 kg pushes a rotating platform of mass M = 85.0 kg and radius R = 3.00 m at the playground with a tangential force tF of magnitude 55.0 N for 10.0 s. Ignore air resistance. a. What is the angular speed of the platform at the end of this time if the platform was initially at rest? b. The man then jumps onto the edge of the platform. What is the angular speed of the platform after he gets on?

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