Imagine that a tank is filled with water. The height of the liquid column is 7 meters and the area is 1.5

square meters (m2

). What's the force of gravity acting on the column of water?

A. 73,500 N

B. 102,900 N

C. 68,600 N

D. 110,700 N

Given:

liquid column is 7 meters and the area is 1.5 square meters (m2)

Required:

force of gravity

solution:

P = F/A where P is pressure, F is force and A is area

Since P = DgH where D is density, g is gravitational acceleration and H is height

DgH = F/A

F = ADgH

Let us assume D for water is 1000kg/m3

F = (1.5m2) (1000kg/m3) (9.8m/s2) (7m)

F = 102,900N