Fluid Mechanics
Drag force acting on a body does not depend upon the

Density of the fluid
Projected area of the body
Velocity of the body
Density of the body

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Fluid Mechanics
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

Relative roughness
Friction co-efficient for flows at equal Reynold number
Absolute roughness
All of these

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