For the Stoke’s law to be valid in the case of a falling sphere in a

1.	For the Stoke’s law to be valid in the case of a falling sphere in a fluid, the_____________________?
A.	Reynolds number (based on sphere diameter) should be < 1
B.	Flow around the sphere should be in turbulent region
C.	Sphere must be metallic
D.	Fluid density should be constant
Answer» D. Fluid density should be constant

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For the Stoke’s law to be valid in the case of a falling sphere in a fluid, the_____________________?

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