angular momentum = (moment of inertia) * (angular velocity)
dL/dt = (moment of inertia) * (angular accleration) = sum of external torques
Given m = 500 kg, r = 10 m, torque = 600 N-m ccw, can you figure out at time T = 10 seconds a) the linear speed of a point on the equator? b) the rotational kinetic energy of the sphere? c) the angular momentum of the sphere around its center?
In this performance by Yu-na Kim at the 2013 Worlds (or you can see a local copy ),
Stars form as large clouds of gas and dust collapse.
Image courtesy of NASA/ESA/STScI/J. Hester and P. Scowen
Images courtesy of NASA/JPL-CalTech/N. Evans and Spitzer Space Telescope