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

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

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Hydraulics & Fluid Mechanics
Choose the wrong statement

fluids are capable of flowing
fluids conform to the shape of the con-taining vessels
when in equilibrium, fluids cannot sustain tangential forces
when in equilibrium, fluids can sustain shear forces

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

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

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