A student on a piano stool rotates freely by an angular speed of around 3.05 rev/s. The student holds a mass of 1.00 kg in each outstretched arm, 0.789 m from the axis of rotation. The join moment of inertia of the student and the stool, avoiding the two masses, is around 5.53kg* m^2, a value which remains constant.
As the student pulls his arms inward, his angular speed rises to 3.59 rev/s. Determine how far are the masses from the axis of rotation at this time, considering the masses to be points?
Compute the initial kinetic energy of the system.
Compute the final kinetic energy of the system.