Question 6. [20 Points] A Newtonian liquid (viscosity = 0.002 N . s/m; density = 1000 kg/m) is forced through the circular tube shown in the Figure below. Assume that the flow is steady. -2 m 4 mm Ah Density of gage fluid = 2000 kg/m A differential U-tube manometer is connected to the tube as shown to measure the pressure drop along the tube. When the differential reading, Ah, is 9 mm, what is the average flow velocity in the tube [15 Points]? Note that you will first need to assume that the flow is laminar and, in the end, check the Reynolds number to confirm that the flow is indeed laminar (5 Points)