A flat plate with an area of 1.7 m2 is moved at a velocity of 1.5 m/s over a stationary plate as shown in Figure 1.27. Two lubricants are contained in the 0.7-mm space between the plates. The bottom...

A flat plate with an area of 1.7 m2 is moved at a velocity of 1.5 m/s over a stationary plate as shown in Figure 1.27. Two lubricants are contained in the 0.7-mm space between the plates. The bottom 0.4 mm contains a lubricant with a dynamic viscosity of 0.2 Pa·s, and the top 0.3 mm contains a lubricant with a dynamic viscosity of 0.3 Pa·s. (a) What is the velocity at the interface between the two lubricants? (b) What force is required to move the top plate?