Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that would result in a braking torque of 400 lb. in., assuming that the drum is rotating counterclockwise. Neglect the weight of the brake arm. 60° ▸ 4 in. A -2 in. B in.-² 4 in. 60° D

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