Hydraulics & Fluid Mechanics
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the centriod, if

All of these
the area is inclined
the area is horizontal
the area is vertical

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

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

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