A ballet student with her arms and a leg extended has a moment of inertia of 2.4 kgm^2 as she spins with a rotational speed of 1.0 rev/s. As she draws her arms and a leg in toward her axis of rotation, her moment of inertia becomes 0.60 kgm^s. Determine her final rotational speed.

Answer 1

angular momentum is conserved

angular momentum = moment of inertia * rotational speed