Discussion
Which pair of derivatives sets the short-period frequency and damping respectively?
Answer: C
Frequency comes from \( M_\alpha \) and damping from \( M_q + M_{\dot\alpha} + Z_\alpha/u_0 \), so the first option names them correctly. Drag and lift with speed are the phugoid's derivatives. Elevator effectiveness and hinge moments concern control and stick force rather than the free motion. The last pair are lateral derivatives entirely, which cannot appear in a longitudinal mode because the two problems decouple for small perturbations.
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