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The concrete (specific weight = 150 lb/ft3 ) seawall of Fig

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The concrete (specific weight = 150 lb/ft³ ) seawall of Fig. P2.123 has a curved surface and restrains seawater at a depth of 24 ft. The trace of the surface is a parabola as illustrated. Determine the moment of the fluid force (per unit length) with respect to an axis through the toe (point A).