Oil of density 870 kg/m and viscosity 0.8 Pa-s is being pumped from the lower reservoir to the higher reservoir by a pump with a power rating of 150 kW and an efficiency of 80%. Calculate the mass flow rate of oil between the tanks if the energy loss by friction is 120 J/kg. 50 m D= 0.2 m Pump PROBLEM 5-5 -D=0.15 m