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Q: A freshwater marsh is drained to the ocean through an automatic tide gate that is 4 ft wide and 3 ft high. The gate is held by hinges located along its top edge at A and bears on a sill at B. At a given time, the water levels in the marsh and in the ocean are 6 ft and 9 h = d = ft, respectively. Determine the force exerted by the sill on the gate at B and the hinge reaction at A. (Specific weight of salt water = 64 lb/ft3.)
