Hydraulics & Fluid Mechanics
The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is

always above the centroid of the area
always below the centroid of the area
None of these
at the centroid of the submerged area

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

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