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
According to Bernoulli’s equation for steady ideal fluid flow

the energy is constant along a stream-line but may vary across streamlines
total energy is constant throughout
principle of conservation of mass holds
velocity and pressure are inversely proportional

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