Consider the pressure driven flow between stationary parallel plates separated by distance b. Coordinate y is measured from the bottom plate. The velocity field is given by u=U(y/b)[1-(y/b)]. Obtain an expression for the circulation about a closed contour of height h an length L. Evaluate when h=b/2 and when h=b. Show that the same result is obtained from the area integral of the Stokes Theorem.