A popular brand of pressure washer claims to deliver 330 litres per hour of water at a pressure of 80 bar, drawing 1400 W of electrical power in the process. Pressure washers of this type consist of an electric motor that drives a small compressor to pressurize water fed into it through a garden hose.

Question

A popular brand of pressure washer claims to deliver 330 litres per hour of water at a pressure of 80 bar, drawing 1400 W of electrical power in the process. Pressure washers of this type consist of an electric motor that drives a small compressor to pressurize water fed into it through a garden hose.
Show that the amount of power in the water flow when the washer is in operation is approximately 736 W
Calculate the efficiency with which the electrical input energy is converted to hydraulic energy in the water
Calculate the diameter of the output nozzle of the washer
Assuming all the pressure is dropped at the output nozzle, use its cross-sectional area to calculate the reaction force exerted on the user when the washer is in operation

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