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Question: two coaxial plane circular discs each 200 mm diameter are...

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Two coaxial, plane, circular discs, each 200 mm diameter, are separated by a film of oil 60 um thick. The density of the oil is 880 kg/m3 and its kinematic viscosity 170 mm2ls, Neglecting edge effects on the discs estimate the power required to rotate one disc relative to the other at 20 rev/s. isCS

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