(a) An ice skater with an initial moment of inertia of 1.34 kgm2 with arms outstretched horizontally is initially spinning at 9.10 revs/s. She draws her arms vertically in by her side reducing her moment of inertia to 1.25 kgm2. What is her new angular velocity?

(b) A solid cylinder with a diameter of 36.8 cm and mass 13.2 kg is rolling on a horizontal surface with a linear velocity of 1.76 m/s.

Calculate the angular momentum of the cylinder.

I got 61.3 rad/s for the final angular velocity for the skater

and for b I got Moment of Inertia I= 0.22 and angular momentum L=2.1

Can someone please check if I did these correctly ?

It would be greatly appreciated !