Wednesday, December 23, 2009

What is the minimum velocity of an object to escape from the Mercury鈥檚 gravity?

4.4 km/sWhat is the minimum velocity of an object to escape from the Mercury鈥檚 gravity?
I beg to differ. 4.4 seems a popular estimate but 4.25 has a more solid foundation.


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What is the minimum velocity of an object to escape from the Mercury鈥檚 gravity?
Vesc = sqrt(2GM/R). G = 6.673E-11. For Mercury, M = 3.302E23 kg and R = 2439700 m. This yields Vesc = 4.250 km/s.

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