In the flow of air at 20°C and 1 atm past a flat plate in Fig. P7.43, the wall shear is to be determined at position x by a floating element (a small area connected to a strain-gage force measurement). At x = 2 m, the element indicates a shear stress of 2.1 Pa. Assuming turbulent flow from the leading edge, estimate (a) the stream velocity U, (b) the boundary layer thickness δ at the element, and (c) the boundary-layer velocity u, in m/s, at 5 cm above the element.

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with Floating element negligible gap