Hydraulics & Fluid Mechanics
The line of action of the buoyant force acts through the

centroid of the volume of fluid vertically above the body
centriod of the displaced volume of fluid
center of the volume of floating body
center of gravity of any submerged body

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

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

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