A gate at the bottom of a dam is 10 ft tall by 30 ft wide. The specific weight of the water is 62.4 lbf/ft3. If the water is 50 ft deep, the total force on the gate is most nearly:

The total force is most nearly 940,000lbf

Explanation:

Total force = specific weight * volume

Volume = length * width * depth = 10ft * 30ft * 50ft = 15,000ft^3

Total force = 62.4lbf/ft^3 * 15,000ft^3 = 936,000lbf which is most nearly 940,000lbf