Hydraulics and Fluid Mechanics in ME
The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

Newton's law of motion
Newton's law of cooling
Newton's law of viscosity
Newton's law of resistance

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Hydraulics and Fluid Mechanics in ME
Coefficient of velocity is defined as the ratio of

Area of jet at vena contracta to the area of orifice
Actual discharge through an orifice to the theoretical discharge
Actual velocity of jet at vena contracta to the theoretical velocity
None of these

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