8. A 20-kg plate is resting on a very thin film of SAE-30 oil,F which has a viscosity of 239.39 mPa.s at 20 °C. The oil thickness is 0.15mm and

the velocity profile across the0.5m/s\60°thickness is linear. The bottom of the plate has a contact area of 0.2m? with the oil. As shown in the figure, you are putting a force at 60° to the center of the plate to slide it over the oil with a constant velocity of 0.5m/s. What is the magnitude of that force? (Hint: Watch video "Chapter 1-Viscous plate.mp4")