Q. A turbulent boundary layer velocity profile is approximated by 1/5 U y 8 for y Co and u=U for y>o. U Use the integral momentum equation to derive an expression for the dependence of the boundary thickness (6) and skin friction coefficient (Cf) on the local Reynolds number. 0.0468 de (R.)"4' da (Hint: C dp 0_0; for = 0) 2 dx es