Water at $25$ C flows through a tube of radius $0\mathrm{.}02$ m $($ro$).$ At a point close to the wall $($r$=0\mathrm{.}0199$ m$)$ the velocity was measured and a value of $3$x$10-4$ m$/$s was reported. Calculate the shear stress in the pipe wall and the velocity distribution using the universal velocity distribution.