Assignment:
A turn-table on a frictionless vertical axis has a radius of 1.5 m and a moment of rotational inertia of 150 kgm^2. It is at rest until a 75 kg person who had been standing still (and who can be treated as a point), begins to walk around the rim at a speed of 2.0 m/s with respect to the turn-table.
a) what is the speed of the person with respect to the Earth?
b)How much work did the person do in bringing the turn-table up to speed?