1. A pump steadily delivers water through a hose terminated by a nozzle. The exit of the nozzle has a diameter of 2.5 cm and is located 4 m above the

pump inlet pipe, which has a diameter of 5.0 cm. The pressure is equal to 1 bar at both the inlet and outlet, and temperature is constant at 20°C. The magnitude of the power input required by the pump is 8.6 kW, and the acceleration of gravity is g=9.81 m/s². Determine the mass flow rate delivered by the pump, in kg/s.