a viscous liquid (density of 1180 kg/m^3 and dynamic vicosity of 0.0045 N s/m^2) flows at a volumetric rate of 12.6 ml/s through a horizontal 4-mm diameter tube. After developing the velocity profile of this Poiseuille flow across the 2m long tube, what is the estimated velocity in m/s at a radius of 1.2 mm the tube?