Fluid Mechanics
Potential flow is the flow of

Incompressible fluids with no shear
Compressible fluids with shear
Compressible fluids with no shear
Incompressible fluids with shear

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Remains constant over the cross-section
Varies parabolically across the cross-section
Is zero at the wall and increases linearly to the centre
Is zero at the centre and varies linearly with the radius

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