Glycerol at 20C is flowing between two horizontal parallel fixed plates in a steady-state laminar flow. The distance between the plates is b = 8cm. The velocity profile of the flow between the plates is given by: Uz= uz(y) 22 4! (by ya) 1 Ap The pressure drop is 4 800 Pam-1 and the viscosity of the glycerol at 20C is = 1.069 Pas. Calculate the shear stress (in Pa) on a horizontal plane 5cm above the bottom plate. 21