(a) By modelling the ballerina with her arms and legs tucked in as a uniform cylinder of mass 60kg and radius 13cm, find her angular momentum after she has tucked her arms in. The moment of inertia of a uniform eylinder of mass M and radius R is given by I = MR 1 = (b) Hence, estimate her moment of inertia with respect to her axis of rotation when her arms and legs were outstretched.
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