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A man of 80 kg mass is standing on the r...

A man of 80 kg mass is standing on the rim of a circular platform rotating about its axis. The platform with the man on it rotates at 12.0 r.p.m. How will the system rotate, if the man moves to the platform's centre? What work will the man perform in changing his position? The mass of the platform is 200 kg and its radius is 1.2 m.

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216 r.p.m. ; 280 J
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