A laminar boundary layer develops along a flat plate and its thickness at a particular point is δ = 0.1 m. If we approximate the boundary-layer velocity distribution by
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then calculate the local shear τ and friction coefficient Cf. Assume that U∞ = 30 m/s, ρ = 1.2 kg/m3, and μ = 1.8 × 10-5 N s/m2.