a) Starting from the momentum balance equation (62), derive the equations for shear stress and velocity (similar to Eq. 9-2 and 9-3) with the assumptions of steady laminar flow between two plates, top plate moving, the flow moving in upward direction (Figure 9-1 conditions except for the flow direction). b) Derive equations for umax,uave in terms of a (distance between two plates), pressure drop (dp/dx), and viscosity