Sea water stands 2 ft above the top of a 3 ft by 6 ft vertical gate on one side, and 1 ft above its center on the other side. What horizontal force applied at the top will be required to open it, if the gate is hinged at the bottom on the shorter side? (w = 64.0 lb/cu ft)

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Q: total force on the sill neglecting the weight of the gate.

A: