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

Question

A person of 80 &#160; kg mass is standing on the rim of a circular platform of mass 200 &#160; kg rotating about its axis at 5 revolutions per minute (rpm). The person now starts moving towards the centre of the platform. What will be the rotational speed (in rpm ) of the platform when the person reaches its centre....

Aicharya · Accepted Answer

Applying conservation of angular momentum, mR 2 + MR 2 2 &#969; = MR 2 2 &#969; ' 80 + 200 2 &#215; 5 = 200 2 &#969; ' &#969; ' = 9 rev / sec .

A person of 80   kg mass is standing on the rim of a circular platform of mass 200   kg rotating…

Solution

A person of 80 &#160; kg mass is standing on the rim of a circular platform of mass 200 &#160; kg rotating…

Solution

A person of 80 kg mass is standing on the rim of a circular platform of mass 200 kg rotating…