Glossary entry (derived from question below)
英語 term or phrase:
escape speed
日本語 translation:
脱出速度(または第二宇宙速度)
英語 term
escape speed
When an object is traveling exactly at escape speed, it is in a parabolic orbit with the body at the focus of the parabola. A parabolic path is open; hence an object following such a path will never return to the body. (Conservapedia)
Black holes, having infinite density, have an infinitely large escape speed. But it turns out that the escape speed value depends on how far an object is from a body of mass. So there is a certain distance from a black hole where the escape speed just equals the speed of light. (Are black holes real?)
One somewhat counterintuitive feature of escape velocity is that it is independent of direction, so that "velocity" is a misnomer; it is a scalar quantity and would more accurately be called "escape speed". (Space Wiki)
4 +2 | 脱出速度(または第二宇宙速度) |
MKStar
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Sep 26, 2008 03:54: changed "Stage" from "Submission" to "Selection"
Nov 12, 2008 15:54: changed "Stage" from "Selection" to "Completion"
Proposed translations
脱出速度(または第二宇宙速度)
人工衛星の軌道(きどう)は加速する「速度」「方向」などによって変化します。地球から水平に秒速約7.9kmで打ち出すと、地球を円軌道で回る人工衛星となります。そのために必要な速度を「第1宇宙速度」といいます。打ち出し速度を11.2kmにすると地球の重力を脱出して太陽のまわりを回る軌道にのり、この速度を「第2宇宙速度」または「脱出速度」といいます。 (JAXA)
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