Solve the problem. See Examples 8 and 9.Great Chicago flood. The great Chicago flood of Ap...

Solve the problem. See Examples 8 and 9.

Great Chicago flood. The great Chicago flood of April 1992 occurred when an old freight tunnel connecting buildings in the Loop ruptured. As shown in the figure, engineers plugged the tunnel with concrete on each side of the hole. They used the formula F = WDA to find the force F of the water on the plug. In this formula the weight of water W is 62 pounds per cubic foot (lb/ft3), the average depth D of the tunnel below the surface of the river is 32 ft, and the cross-sectional area A of the tunnel is 48 ft2. Find the force on the plug.

Figure for Exercise 85