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The frictional resistance for fluids in motion is (a)inversely proportional to the square of the surface area of contact

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in Fluid Mechanics by (118k points)
The frictional resistance for fluids in motion is

(a) inversely proportional to the square of the surface area of contact

(b) inversely proportional to the surface area of contact

(c) proportional to the square of the surface area of contact

(d) proportional to the surface area of contact

I had been asked this question by my college professor while I was bunking the class.

This question is from Loss of Energy in Pipes in chapter Flow Through Pipes of Fluid Mechanics

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Right option is (d) proportional to the surface area of contact

Easy explanation: According to the laws of fluid friction, the frictional resistance is proportional to the surface area of contact for both laminar and turbulent flows.

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