To increase the effect of rotation figure skaters pull their arms in when they spin. Let, consider a figure skater with moment of inertia with her arms outstretched of I (initial) = 3.6kgm^2 and I(final) =1.1kgm^2 with her arms pulled in. She begins out spinning at w = 0.85 with her arms outstretched.
i) Determine w (final) after she pulls her arms in.
ii) Determine the increase in the rotational kinetic energy.