For a laminar boundary layer with thickness δ, resulting from the flow of an incompressible fluid parallel to a flat surface, assume that the velocity profile in the boundary layer can be approximated...

For a laminar boundary layer with thickness δ, resulting from the flow of an incompressible fluid parallel to a flat surface, assume that the velocity profile in the boundary layer can be approximated according to

Calculate the values of
and

Find the shear stress at the wall, τ_s, as a function of μ U_∞, and δ.