An electric motor converts electricity to rotating shaft work with an efficiency of 42%. The rotating shaft turns the impeller in the pump which, in turn, increases the pressure of the water by 300kPa. If the motor is consuming 3.8 kW of electricity, and water flow through the pump is 4.18 Liter/sec, what is the mechanical efficiency with which the pump converts the rotation of the impeller into water pressure?

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Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.