A cylindrical tank of radius 5 ft and height 9 ft is two-thirds filled with a liquid of weight density P Ibs./ft?. The work (in ft-lbs.) required to pump all the water over the upper rim is given by the integral 25ap / (9-y)dy 25 (9-y)y? 81 25ap (9-y)y? dy 81

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A: General formula for volume of cone, V= (Pi* R^2 * H)/3