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Q.

A person of 80 kg mass is standing on the rim of a circular platform of mass 200kg rotating about its axis at 5 revolutions per minute (rpm). The person now starts moving towards the center of the platform. What will be the rotational speed (in rpm) of the platform when the person reaches its centre_________

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answer is 9.

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Detailed Solution

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I1ω1=I2ω2

I1=MR22+mR2; I2=12MR2

⇒ω2=ω1MM+2m=5×360200=9 rpm

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