A vertical dike has the shape of an isosceles trapezoid with parallel sides that are horizontal. It measures 30m in height, 20m in its lower part and 40m in its upper part. Finally, this dike retains 25m of water, as in the drawing below. The hydrostatic force exerted by the water on the portion of the dike between y and y+delta y is approximately p(y) delta y. What is p(y)? The density of water is rho=1000kg/m^3; g=9,8m/s^2 What is the total hydrostatic force acting on the dike ? Give the answer to 3 significant figures close.