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Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 316 / 1 / vi / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2021 iii Paper 316 1 vi
2026-09-28  0 By others on same topic  0 Discussions Create my own version
The limiting trajectory grazes the planet at periapsis Rp​. Equating the asymptotic and periapsis values of specific angular momentum and using the vis-viva equation gives
bmin2​Δvpc2​=Rp2​(Δvpc2​+Rp​2GMp​​).
(1)
Hence the comet avoids the planet when
b>bmin​=Rp​1+Rp​Δvpc2​2GMp​​​​.
(2)

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