For flow over a flat plate with an extremely rough surface, convection heat transfer effects are known

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For flow over a flat plate with an extremely rough surface, convection heat transfer effects are known to be correlated by the expression:

\[N u_{x}=0.04 \operatorname{Re}_{x}^{0.9} \operatorname{Pr}^{1 / 3}\]

For airflow at \(50 \mathrm{~m} / \mathrm{s}\), what is the surface shear stress at \(x=1 \mathrm{~m}\) from the leading edge of the plate? Assume air at \(300 \mathrm{~K}\).

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