A ship's anchor weighs 5000 N. Its cable passes over a roller of negligible mass and is wound around a hollow cylindrical drum of mass 380 kg and radius 1.1 m. The drum is mounted on a frictionless axle. The anchor is released and drops 16 m to the water.
Use energy considerations to determine the drum's rotation rate when the anchor hits the water. Neglect the mass of the cable.