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A dam on a river is built so that the wall facing the water is shaped...

A dam on a river is built so that the wall facing the water is shaped like the region above the curve y=0.3 x^4 and below the line y= 140 . (Here, distances are measured in meters.) The water level is 20 meters below the top of the dam. Find the force (in Newtons) exerted on the dam by water pressure. (Water has a density of 1000 "kg"/m^3, and the acceleration of gravity is 9.8 m/sec^2 .)

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