2–92 A large plate is pulled at a constant speed of U 4 m/s over a fixed plate on 5-mm-thick engine oil film at 20°C. Assuming a half-parabolic velocity profile in the oil film, as sketched, determine...

Extracted text: 2–92 A large plate is pulled at a constant speed of U 4 m/s over a fixed plate on 5-mm-thick engine oil film at 20°C. Assuming a half-parabolic velocity profile in the oil film, as sketched, determine the shear stress developed on the upper plate and its direction. What would happen if a linear velocity profile were assumed? y U = 4 m/s h = 5 mm Engine oil V