For the velocity distribution given in Problem 11.52, it can be shown that the shear stress as a function of the distance x along a flat surface can be expressed in nondimensional form as...

For the velocity distribution given in Problem 11.52, it can be shown that the shear stress as a function of the distance x along a flat surface can be expressed in nondimensional form as

Use this relationship to determine a nondimensional equation for the total drag force, FD, on a flat surface of length L and width b.