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4. A 55 mm diameter shaft is pulled through a cylindrical bearing as shown in Fig. 4. The lubricant that fills the 0.35 ft gap between the shaft and bearing

is an oil having a kinematic viscosity of7.5 x 10 m /s and a specific gravity of 0.85. Determine the force P required to pull the shaft ata velocity of 9.5 m/s. The mass of cylinder is 2.5 kg. Assume the velocity distribution in the gapis linear. [Answer: 32 N]

Fig: 1