| 单词 | escape velocity |
| 释义 | > as lemmasescape velocity escape velocity n. (of space vehicles etc.), a speed sufficient to overcome the gravitational force of a planet. ΘΚΠ society > travel > air or space travel > space flight > [noun] > a space shot or flight > course or trajectory of spacecraft > escape from gravity field of planet > speed sufficient for escape velocity1934 1934 Space (Cleveland) I. iv. 1 The equation for escape velocity is derived from the equation for the orbital velocity of a particle about a mass. 1945 H. S. Zim Rockets & Jets 207 Calculations based on the law of falling bodies indicate that a speed of about seven miles per second or 25,000 per hour is essential before ‘escape velocity’ is attained. 1954 N.Y. Times 4 Apr. E9/7 The escape velocity from the earth is 25,000 miles an hour, yet astronauts talk glibly of achieving it, though they are fully aware of the heat that will be generated. 1959 Listener 22 Jan. 161/1 The Moon has a diameter of only 2,160 miles, and an escape velocity of one and a half miles per second. < as lemmas |
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