Use of boundary-layer equations, air at 1 atm and 20^oC flows tangentially on both sides of a thin, smooth flat plate of width W = 10 ft, and of length L = 3 ft in the direction of the flow. The velocity outside the boundary layer is constant at 20 ft/s. 

(a) Compute the local Reynolds number Re_x. = xv_∞/v, at the trailing edge. 

(b) Assuming laminar flow, compute the approximate boundary-layer thickness, in inches, at the trailing edge. Use the results of Example 4.4-1. 

(c) Assuming laminar flow, compute the total drag of the plate in lb_f. Use the results of Examples 4.4-1 and 2.