2281

Physics Rotational Mechanics Level: High School

Conservation of Angular Momentum

A flat uniform circular disk (radius = 2.40 m , mass = 1.00 102 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 55.0 kg person standing 1.15 m from the axis , begins to run on the disk in a circular path and has a tangential speed of 2.00 m/s relative to the ground . Find the resulting angular speed of the disk (in rad/s) and describes the direction of the rotation