A person of mass is standing on a circular platform of mass rotating about its axis at rpm (revolutions per minute). 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 center.
Option: 1 3
Option: 2 6
Option: 3 9
Option: 4 12
Applying conservation of angular momentum -
Now
When the person reaches center -
So,
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