1. The problem statement, all variables and given/known data A flat uniform circular disk (radius = 2.18 m, mass = 1.22E+2 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a frictionless axis perpendicular to the center of the disk. A 42.9 kg person, standing 1.29 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 2.20 m/s relative to the ground. Calculate the resulting angular speed of the disk (in rad/s). I don't even know where to start. Please help?!