A tank is in the form of inverted right circular cone 8 m across the top and 10 m deep (as shown in the figure). If it is filled to the height 8 m with oil weighing 950 kg/m3 , solve the work done in pumping the oil to the top of the tank. Hint: the number of newtons of force necessary to lift an element is the product of kilograms of mass and 9.81, the numbers of meters per second squared in the acceleration due to gravity.

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.