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A ballet dancer spins about a vertical axis at 60 rpm with his arms closed. Now he stretches his arms such that M.I increases by 50%. The new speed of revolution is ………in rpm

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answer is B.

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Detailed Solution

I₁ $ω_{1} = I_{2} ω_{2}$ $S I N C E ω = 2 π n$

$I_{1} n_{1} = I_{2} n_{2}$

I X 60 =3/2 X I X $n_{2}$

n₂= 40

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