Hydraulics and Fluid Mechanics in ME
The Newton's law of resistance is based on the assumption that the

Fluid particles do not exert any influence on one another
Space around the body is completely filled with the fluid
All of these
Planes of the body are completely smooth

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Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The velocity of flow is large
The available head of liquid is less than 5 times the height of orifice
The available head of liquid is more than 5 times the height of orifice
The size of orifice is large

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