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

volume of the fluid vertically above the body
displaced volume of the fluid
volume of the floating body
submerged body

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

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