Received date: 2016-02-17
Revised date: 2016-04-15
Online published: 2017-02-20
Key words: cosmic speed; rocket; solar system; gravity; conservation of mechanical energy
YU Feng-jun . The fourth cosmic speed of the Moon[J]. College Physics, 2017 , 36(2) : 8 -10 . DOI: 10.16854 /j.cnki.1000-0712.2017.02.003
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