Question

What is the angular momentum of a 0. 25 kg mass rotating on the end of a piece of rope in a circle of radius 0. 75m at an angular speed of 12. 5 rad/s?

Answer 1

The angular momentum before I pull the cord in is L = Ibωb = (0.25 kg-m2) (5 radians/second) = 1.25 kg-m2/s.