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Viscous drag on a small sphere of radius a at speed v in a fluid of viscosity eta is given by which expression?
A6 pi eta a v
B4 pi eta a v
C6 pi eta a^2 v
D2 pi eta a v
Answer & Solution
Correct answer: A. 6 pi eta a v
Stokes' law states the drag force on a sphere is F = 6 pi eta a v.
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