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Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 315 / 2 / e / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2021 iii Paper 315 2 e
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Hydrostatic balance makes the atmospheric column mass (P0​−Ptop​)/g. Multiplying by the surface area gives the mass of a thin hydrostatic atmosphere
Matm​≃g4πRp2​(P0​−Ptop​)​≃GMp​4πRp4​P0​​​,
(1)
where the second expression neglects the top pressure and atmospheric self-gravity.

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