Answer :
The minimum head pressure by 5 PSI. Using information about how pressures add up, the actual head pressure would be the sum of the previous pressure and the increase, resulting in 32.7 PSI, but since this value is not an option, the closest choice given is 35 PSI. Therefore, the correct option is b. 35 psi.
If the minimum head pressure required was 25 PSI instead of 20 PSI, it implies that the baseline or minimum required pressure has increased by 5 PSI. Given the details and focusing on the concept of pressure in fluid dynamics, we need to consider any additional pressure that would be present in the system. Typically, when constructing such problems, the actual pressure includes the atmospheric pressure if the fluid is exposed to the atmosphere.
Referring to the information provided, wherein the total pressure with a height of water at 30 feet results in a pressure of 27.7 PSI (comprising both the water pressure at that height and the atmospheric pressure), we can apply a similar approach to the scenario at hand.
If the minimum head pressure is raised by 5 PSI, we can infer that the actual head pressure would increase proportionally if all other factors remain the same. Assuming no other changes, and using the example of 27.7 PSI from the provided information, an increase in minimum head pressure to 25 PSI would likely result in an actual head pressure of 27.7 PSI + 5 PSI = 32.7 PSI. Since this is not an exact option given in the question, the closest value would be 35 PSI (option b), assuming we round to the nearest available choice in a multiple-choice setting. However, without additional information or context to confirm the relationship between the minimum required pressure and other contributing factors, we can't provide a definitive answer. Thus, the student should review their problem set-up and assumptions or seek clarification if needed.
