The earth is able to retain its atmosphere because of _____

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Class 11 Physics Practice Test: Gravitation - Escape Speed — practice the complete quiz, review flashcards, or try a random question.

On the surface of the Earth, the escape velocity is about 11.2 km/s, which is approximately 33 times the speed of sound (Mach 33) and several times the muzzle velocity of a rifle bullet (up to 1.7 km/s). However, at 9,000 km altitude in "space", it is slightly less than 7.1 km/s.


The earth is able to retain its atmosphere because of _____