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2.43 Crude oil, with specific gravity SG=0.85 and viscosity =2.15103lbfs/ft2, flows steadily down a surface inclined =45 degrees below the horizontal in a film of thickness h=0.1in. The velocity profile is given by u=g(hy2y2)sin (Coordinate x is along the surface and y is normal to the surface.) Plot the velocity profile. Determine the magnitude and direction of the shear stress that acts on the surface. 2.48 A 73-mm-diameter aluminum (SG=2.64) piston of 100mm length resides in a stationary 75mm-inner-diameter steel tube lined with SAE 10W30 oil at 25C. A mass m=2kg is suspended from the free end of the piston. The piston is set into motion by cutting a support cord. What is the terminal velocity of mass m ? Assume a linear velocity profile within the oil