Answer: The floor-polishing machine rotates at a constant

Chapter 8, Problem 8-109

(choose chapter or problem)

The floor-polishing machine rotates at a constant angular velocity. If it has a weight of 80 lb, determine the couple forces F the operator must apply to the handles to hold the machine stationary. The coefficient of kinetic friction between the floor and brush is mk = 0.3. Assume the brush exerts a uniform pressure on the floor.

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