The floor-polishing machine rotates at a constant angular velocity. If it has a weight of...

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 µk = 0.3. Assume the brush exerts a uniform pressure on the floor.