The steel-plate clamp shown is used to lift a steel plate H weighing 550 lb. Knowing that the normal force exerted on steel cam EG by pin D forms an angle of 40° with the horizontal and neglecting the friction force between the cam and the pin, determine the smallest allowable value of the coefficient of static friction between the cam and the plate.

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300 m 450 mm 500 mm 400 mm- -400 mm-