Hydraulics & Fluid Mechanics
Fluid is a substance that

cannot remain at rest under action of any shear force
cannot be subjected to shear forces
has the same shear stress.at a point regardless of its motion
always expands until it fills any container

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

weight of liquid vertically above the curved surface
force on a vertical projection of the curved surface
force on the horizontal projection of the curved surface
product of pressure intensity at its centroid and area

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