Recent interest in the old problem of the motion of a coin spinning on atabletop has focused on mechanisms of dissipation of energy as the angle alphaof the coin to the table decreases, while the angular velocity Omega of thepoint of contact increases. Following a review of the general equations ofmotion of a thin disk rolling without slipping on a horizontal surface, wepresent results of simple experiment on the time dependence of the motion thatindicate the dominant dissipative power loss to be proportional to the Omega^2up to and including the last observable cycle.
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