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The outstretched hands and farms of a fighte skater preparing for a spin can be considered a slender rod pivoting about an axis through its center $($Eigure $1).$ When his hands and arms are brought in and wrapped around his body to execute the $$pin$,$ the hands, fid arms can be considered a thin$-$walled hollow cylinder. His hands and arms have a combined mass $9\mathrm{.}0$ kg $.$ When outstretched, they span $1\mathrm{.}6$ m ; when wrapped, they form a thinwalled hollow grliptler of radius $23$ cm $.$ The moment of inertia about the rotation axis of the remainder of his body is constant and equal to $0\mathrm{.}4kg*m^2.$

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$1$ of $1$

Part A

If his original angular speed is $0\mathrm{.}50re\frac{v}{s},$ what is his final angular speed?

Express your answer in revolutions per second.

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