4. A pirouette is a ballet move where the balerina spins on her toem. The ballerina inable to control the angular speed of her spin by adjusting the ponition of her armaand legs; hence dchanging her man distribution.A ballerina, with her arms and leg outatretched, in initinlly spinning with an angularspend of or rads/a. She then brings in her arms and legs, and her angulur spendineress to 10r rada/a(a) By modelling the ballerina with her arms and legs tucked in as a uniformcylinder of mam 60kg and radius 13kem, find her angular momentum after shehas tucked her arms in. The moment of inertia of a uniform cylinder of mamM und radiun Rin given by /-M(b) Henon, entimate her moment of inertin with respect to her axis of rotationwhen her arms and leg were outatretched.

Final angular momentum after the arms are tucked in Lf=Ifωf=12MR2ωf=1260 kg13 cm210-2 m1 cm210π…

Answered: 4. A pirouette is a ballet move where…

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