A water pump is discharging against a head of 92 feet of water. What is the approximate pressure in psi?

To determine the pressure in psi when a water pump is discharging against a head of 92 feet of water, you can use the formula that converts feet of water to psi. The conversion factor is approximately 0.433 psi per foot of water.

To find the pressure, multiply the height of the water column (in feet) by the conversion factor:

Pressure (psi) = Height (feet) × 0.433 psi/foot

Substituting the given height:

Pressure = 92 feet × 0.433 psi/foot = approximately 39.876 psi

Rounding this value leads us to approximately 40 psi. Therefore, the closest answer choice, which accurately represents this calculation, is that the pressure is approximately 40 psi. This reasoning clarifies why this option is the correct choice in relation to the height of the water head provided.