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A spherical particle (density 2500 kg/m3) is dropped in a tube of fluid. The diameter of...

A spherical particle (density 2500 kg/m3) is dropped in a tube of fluid. The diameter of the tube is 50mm, and the particle achieves a terminal velocity of 1 x 10-4 m/s. If the wall factor is 0.9, what is the size of the particle? Assume Rep < 0.3. Give your answer in mm, to 3 significant figures.

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