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
Fluid is a substance that

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

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