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

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

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Hydraulics & Fluid Mechanics
The normal stress is same in all directions at a point in a fluid

only when the fluid is frictionless
When there is no motion of one fluid layer relative to an adjacent layer
only when the fluid is incompressible and has zero viscosity
irrespective of the motion of one fluid layer relative to an adjacent layer

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