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What is the work done in increasing the ...

What is the work done in increasing the angular frequency of a circular ring of mass `2kg` and radius `25cm` from 10rpm to 20rpm about its axis?

Text Solution

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Work done =increase in rotational kinetic energy
`=1/2 I(omega_(f)^(2)-omega_(i)^(2))=1/2MR^(2)(omega_(f)^(2)-omega_(i)^(2))`
`=1/2xx2xx(0.25)^(2)(((2pi)/3)^(2)-((pi)/3)^(2))=0.2054 J`
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