The space between two square flat parallel plates is filled with oil. Each side of the plate is 0.8 m. The specific weight of the oil is 9620 N/m3. The thickness of the oil film is 14.9 mm and requires a force of 175 N. The liquid having the kinematic viscosity of 15 stokes. Determine (i) the shear stress (ii) the density of oil (iii) the dynamic viscosity in poise and (iv) the moving velocity of the upper plate.

The space between two square parallel flat plates is filled with oil.each side of the plate is 720mm. The thickness of the oil film is 15mm. The upper plate which moves at 3m/s requires a force of 120N to maintain the speed. Determine the dynamic viscosity and kinematic viscosity if specific gravity of oil is 0.95

A metal plate 1.25 m x 1.25 m x 6 mm thick and weighing 10 kg is placed midway in the 24 mm gap between the two vertical plane surfaces as shown in Fig. The gap filled with an oil of sp.gr 0.85 and dynamic viscosity 3 Pa.s. Determine the force required to lift the plate with a constant velocity of 0.15 m/s. Ans. F= 89.052 N

A shaft 70-mm in diameter is being pushed at a speed of 400mm/s through a bearing sleeve 70.2-mm in diameter and 250mm long. The clearance is filled with oil with a kinematic viscosity of v = 0.005 m²/s and SG-0.9. A. Find the frictional resistance exerted by the oil on the shaft in Newtons (N). B. If the shaft in the problem above is fixed axially and rotated inside the sleeve at 2000 rpm, determine the resisting torque exerted by the oil and the power required to rotate the shaft in kilowatts (kW).