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0.002" PROBLEMS 3A.1 Torque required to turn a friction bearing (Fig. 3A.1). Calculate the required torque in lb, . ft and power consumption in horsepower to turn the shaft in the friction bearing shown in the figure. The length of the bearing sur- face on the shaft is 2 in, and the shaft is rotating at 200 rpm. The viscosity of the lubricant is 200 cp, and its den- sity is 50 lb/ft. Neglect the effect of eccentricity. Answers: 0.32 lb, ft; 0.012 hp = 0.009 kW == 2.00" bas Fig. 3A.1. Friction bearing.