Civil Engineering MCQAE Level Civil Engineering
Stokes law gives the drag force on a sphere falling slowly through a viscous fluid as:
Fluid MechanicsStokes LawMEDIUM
Choose the correct answer
A
F_D = 6 pi mu r V
B
F_D = 0.5 Cd rho A V^2
C
F_D = rho V^2 r
D
F_D = 12 pi mu r V
Correct Answer
A. F_D = 6 pi mu r V
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Stokes law: F_D = 6 pi mu r V (valid for Re < 0.5, creeping flow). This is used to derive the terminal velocity of settling particles: V_t = 2r^2(rho_s - rho)g / (9 mu). Used in hydrometer analysis of fine soils.
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