Discussion
A balance reads a normal force of \( 240 \) N at a dynamic pressure of \( 1500 \) Pa on a model of \( 0.4 \) m\( ^2 \) reference area. The force coefficient is
Answer: B
Dividing through, \( 240 / (1500 \times 0.4) = 240/600 = 0.40 \). Reducing raw balance readings to coefficients in this way is what makes the result transferable to full scale, provided the similarity conditions have been respected.
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