4. Problem 12.35 from the textbook. [Statement: 12.35. A centrifugal pump with a 12-in diameter impeller requires a power input of 60 hp when the flow rate is 3200 gpm against a60 ft head. The impeller is changed to one with a 10 in. diameter. Determine the expected flowrate, head, and input power if the pump speed remains the same.]