As shown in Fig. 1, a cylinder of diameter 122mm and length 200mm is placed inside a concentric long pipe of diameter 125 mm. An oil film is introduced in the gap between the pipe and the cylinder. What force is necessary to move the cylinder at a velocity of Im/s? Assume that the dynamic viscosity of oil is 30 cSt and the specific gravity is 0.9. 1.5 $125 $122 200 Fig. 1.

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Pressure and Stress