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

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

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Hydraulics & Fluid Mechanics
Fluid is a substance that

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

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Hydraulics & Fluid Mechanics
For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is

inversely proportional to Reynolds number and directly proportional to pipe wall roughness
inversely proportional to Reynolds number and indpendent of pipe wall roughness
directly proportional to pipe wall roughness and independent of Reynolds number
directly proportional to Reynolds number and independent of pipe wall roughness

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