Hydraulics & Fluid Mechanics
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of friction
force of diffusion
force of adhesion
force of cohesion

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

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

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