Answer:
The correct answer is D. 184.2 PSI.
Step by Step:
The pressure on the bottom of a fluid is given by the formula P = ρgh, where P is the pressure, ρ is the density of the fluid, g is the acceleration due to gravity, and h is the depth of the fluid.
For water, the density ρ is approximately 62.4 lb/ft^3 and the acceleration due to gravity g is approximately 32.2 ft/s^2.
Plugging in the values, we have P = (62.4 lb/ft^3) * (32.2 ft/s^2) * (4 ft) = 7981.44 lb/ft^2.
Converting the units, we have 7981.44 lb/ft^2 * (1 ft^2 / 144 in^2) * (1 lb / 0.45359 kg) * (1 kg / 9.80665 N) = 184.2 PSI.
Therefore, the pressure on the bottom of the water tank filled to a depth of 4 feet is approximately 184.2 PSI.