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A 5 kg cylinder of diameter (Di) 100 mm and length (L) 200 mm falls through...

A 5 kg cylinder of diameter (Di) 100 mm and length (L) 200 mm falls through a lubricated bearing of diameter (Do) 101 mm. If the cylinder is falling at a terminal velocity of 1.5 m/s determine the absolute viscosity oil of the oil surrounding the sides of the cylinder.

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Answer #1

viscous force is upwards and weight acts downward.

It is moving with terminal velocity implies that net force on the cylinder is zero.So equating 2 forces gives viscosity of oil.

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