Discussion
A test section runs at \( 50 \) m/s in air of density \( 1.225 \) kg/m\( ^3 \). The dynamic pressure is
Answer: D
Correct answer: 1531 Pa
\[ q = \tfrac{1}{2}\rho V^{2} = 0.5 \times 1.225 \times 50^{2} = 0.5 \times 1.225 \times 2500 = 1531\ \mathrm{Pa}. \] Omitting the factor of one half gives the 3063 offered. Dynamic pressure matters because every aerodynamic coefficient is a force divided by \( qS \), so an error in it carries straight through to every result the tunnel produces.
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