Discussion
A wing of area \(20\) m squared flies at a dynamic pressure of \(6125\) Pa with \(C_L = 0.4\). The lift is closest to
Answer: B
Correct answer: 49 kN
\[ L = q\,S\,C_L = 6125 \times 20 \times 0.4 = 49\,000\ \text{N} = 49\ \text{kN.} \] The three factors are independent, so the lift equation is a straightforward product once the dynamic pressure is known. Note that the reference area is the plan area of the wing, not its wetted area - using the wrong one is a common source of a factor of two.
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