The water in a jet propelled boat is discharged at the back with an absolute velocity of 20 m/s. The cross-sectional area of the jet at the back is 0.02 m2 and the boat is moving in water with a speed of 30 km/hour. Determine : (i) Propelling force on the boat, (ii) Power required to drive the pump, and (iii) Efficiency of the jet propulsion.

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Friction

Friction is defined as the force that prevents any solid surface, any layer of fluid, or any kind of element or material from sliding.