Условие:
An oil pump is drawing 44kw of electric power while pumping oil with ρ=860 kg/m3 at a rate of 0.1 m3/s.The inlet and outlet diameter of the pipe are 8cm fan 12cm, respectively. If the pressure rise of oil in the pump is measured to be 500 kPa and the motor efficiency is 90 percent, determine the mechanical efficiency of the pump.
