Inside a cylindrical wet$-$walled absorption column, it descends by gravity. the absorbent liquid, as indicated in the figure. The gas circulates with countercurrent flow with the liquid, therefore the central area of the cylinder. For a fluid with constant physical properties and neglecting the effects due to the moving gas phase. Perform a differential momentum balance and determine: $($a$)-$The profile of velocity in the liquid layer, assuming that the thickness remains constant. $($b$)-$The shear stress in the wall of the cylinder. $($c$)-$The volumetric flow of liquid Data: liquid viscosity: $10-3($kg$/$m s$),$ density of liquid: $103($kg$/$m$3),$ cylinder inner diameter: $0\mathrm{.}100$ m$,$ liquid film thickness: $0\mathrm{.}001$ m$.$