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A flat uniform circular disk (radius = 2.10 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 40.0 kg person, standing 1.0 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 2.40 m/s relative to the ground.

Find the resulting angular speed of the disk (in rad/s)

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