A viscous liquid (density of 1180 kg/m3 and dynamic viscosity of 0.0045 N s/m2) flows at a volumetric rate of 12.6 mL/s through a horizontal 4mm diameter tube. Determine the pressure drop in kPa along a 2m length of the tube, which is far from the tube entrance so that the only component velocity is parallel to the tube axis. Clear state and justify assumptions