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Settling velocity of a spherical body in a viscous fluid is given by ___________

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Settling velocity of a spherical body in a viscous fluid is given by ___________

(a) Reynolds law

(b) Newton’s law

(c) Stokes law

(d) Charles law

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This intriguing question originated from Theory of Sedimentation topic in section Sedimentation of Environmental Engineering

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The correct choice is (c) Stokes law

Explanation: According to Stokes law, settling velocity of the particle is given by

vs=g (G-1) d^2/18v where G is the specific gravity, d is the diameter of spherical particles and v is the viscosity.

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