A uniform circular shell of mass M and radius R rotates about a vertical axis on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object of mass m. There is no friction on the pulleys axle; the cord does not slip. What is the speed of the object after it falls a distance h from rest? Use energy considerations. I dont really know where to start, can anyone point me in the right direction?