4.21 A pump is being operated at a rate of 800 gal/min and a pressure of 3,000 psig. The density of the drilling fluid is 15 lbm/gal, and the total nozzle area of the bit is 0.589 sq in. a. Compute the power developed by the pump. Answer: 1,400 hp. b. Compute the power loss to viscous effects. What happens to this energy? Answer: 210 hp. c. Compute the impact force of the jets of fluid against the bottom of the hole. Answer: 2,709 lbf.