Hydraulics & Fluid Mechanics
The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is

zero at plates and increases linearly to midpoint
parabolic distribution across the section
zero at the mid plane and varies linearly with distance from mid plane
constant over the cross section

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Hydraulics & Fluid Mechanics
Fluid is a substance that

cannot remain at rest under action of any shear force
cannot be subjected to shear forces
always expands until it fills any container
has the same shear stress.at a point regardless of its motion

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