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Past exam of the mathematics course of the University of Cambridge / 2025 / iii / Paper 316 / 3 / v

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2025 iii Paper 316 3
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Linear eccentricity damping adds −z/τ to the complex equation:
z˙=(iA−τ−1)z+i∑k​νk​ei(gk​t+βk​).
(1)
Its solution is
z(t)=Ce(iA−1/τ)t+k=1∑2​gk​−A−i/τνk​​ei(gk​t+βk​)​.
(2)
Unlike the undamped free eccentricity, the homogeneous term decays exponentially. The forced response survives, acquires a phase lag, and has finite amplitude
(gk​−A)2+τ−2​∣νk​∣​.
(3)

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