The velocity distribution for laminar flow between parallel plates is given by where h is the distance separating the plates and the origin is placed midway between the plates. Consider a flow of water at 15

^{\circ} \mathrm{C}∘C, with Umax=0.10 m/s and h = 0.1 mm. Calculate the shear stress on the upper plate and give its direction. Sketch the variation of shear stress across the channel.

Answer: