Discussion
Air at \( 1.225 \) kg/m\( ^3 \) and \( 1.8 \times 10^{-5} \) Pa s flows at \( 30 \) m/s over a plate \( 2 \) m long. The Reynolds number at the trailing edge is nearest to
Answer: B
Substituting into \( Re = \rho V L/\mu \) gives \( 1.225 \times 30 \times 2 / (1.8 \times 10^{-5}) = 73.5 / 1.8 \times 10^{5} = 4.08 \times 10^6 \). With transition near half a million, only the first quarter-metre or so of this plate carries a laminar layer.
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