On viscosity (2) The plate in Fig. 1-18 rests on top of the thin film of water, which is at a temperature of 25°C. When a small force F is applied to the plate, the velocity profile across the thickness of the fluid can be described as u = (40y 800y²) m/s, where y is in meters. Determine the shear stress acting on the fixed surface 10 mm 0.32 m/s F a. 35.9 mPa b. 21.5 mPa c. O mPa d. 28.7 mPa viscosity: 0.897 10-3 Pa.s u