2. 6-54 The impeller of a centrifugal pump has inner and outer diameters of 15 and 35 cm, respectively, and a flow rate of 0.15 m³/s at a rotational speed of 1400 rpm. The blade width of the impeller is 8 cm at the inlet and 3.5 em at the outlet. If water enters the impeller in the radial direction and exits at an angle of 60° from the radial direction, determine the minimum power requirement for the pump.