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
All of these
Planes of the body are completely smooth
Space around the body is completely filled with the fluid

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Hydraulics and Fluid Mechanics in ME
Two dimensional flows occurs when

The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
The direction and magnitude of the velocity at all points are identical
The velocity of successive fluid particles, at any point, is the same at successive periods of time
The magnitude and direction of the velocity do not change from point to point in the fluid

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