Hydraulics & Fluid Mechanics
In which of the following the friction drag is generally larger than pressure drag?

a circular disc or plate held normal to flow
an airfoil
a cylinder
a sphere

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

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

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