The device shown in Fig. P9.56 is to be designed to measure the wall shear stress as air...

The device shown in Fig. P9.56 is to be designed to measure the wall shear stress as air flows over the smooth surface with an upstream velocity U. It is proposed that τ_w can be obtained by measuring the bending moment. M, at the base [point (1)] of the support that holds the small surface element, which is free from contact with the surrounding surface. Plot a graph of M as a function of U for 5 ≤ U ≤ 50 m/s, with l = 2, 3, 4, and 5 m.