Post #3890702
2026-07-17 14:55 UTC
@josh0@babka.social @kibcol1049@mstdn.social @paco@infosec.exchange That would be an interesting physics exam question.
"A planet has a radius of 6000 km. It has an atmosphere that consists primarily of helium. What must the mass of the planet be in order to maintain this atmosphere? Assume a perfectly spherical planet, a pressure of 1 Earth atmosphere at the surface, with a pressure that decreases by 20% for every 2000 m above surface level."
Replies (2)
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@BashStKid@mastodon.online 2026-07-17 17:09
@quadrivial@beige.party @josh0@babka.social @kibcol1049@mstdn.social @paco@infosec.exchange You may need to say what the temperature is to estimate the molecular velocity profile relative to escape velocity.
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@kibcol1049@mstdn.social 2026-07-17 15:06
@quadrivial@beige.party @josh0@babka.social @paco@infosec.exchange let me know when you've worked it out. 🤔