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Question: A 125.0-mm-diameter shaft rotates inside a station-ary bushing whose inside diameter = 125.6 mm and length 50.0 mm. In the clearance between the shaft and the bushing is located a lubricating oil whose viscosity = 0.14 Pas. The shaft rotates at a velocity of 400 rev/min; this speed and the action of the oil. are sufficient to keep the shaft centered inside the bushing. Determine the magnitude of the torque due to viscosity that acts to resist the rotation of the shaft.

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