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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク gravitational energy ： ウィキペディア英語版 gravitational energy Gravitational energy is potential energy associated with the gravitational field. This phrase is found frequently in scientific writings about quasars (quasi-stellar objects) and other active galaxies. Quasars generate and emit their energy from a very small region. The emission of large amounts of power from a small region requires a power source far more efficient than the nuclear fusion that powers stars. The release of gravitational energy by matter falling towards a massive black hole is the only process known that can produce such high power continuously. Stellar explosions – supernovas and gamma-ray bursts can do so, but only for a few weeks.〔 == Newtonian mechanics == According to classical mechanics, between two or more masses (or other forms of energy–momentum) a gravitational potential energy exists. Conservation of energy requires that this gravitational field energy is always negative.〔Alan Guth'' The Inflationary Universe: The Quest for a New Theory of Cosmic Origins'' (1997), Random House , ISBN 0-224-04448-6 Appendix A: ''Gravitational Energy'' demonstrates the negativity of gravitational energy.〕 Particularly, between any two point masses $m$ and $M$ (this works for the spherical bodies also), there always exists a gravitational force of $F\; =\; GmM/r^2$ where r is the distance between their centers. Increasing the distance from $r\; =\; r\_0$ to $r\; =\; r\_1$ reduces the force, but, since forces in Newton mechanics indicate how much potential energy is lost over space, $F\; =\; -$, this separation requires $\backslash int\_^\; dr\; =\; \backslash left\; .\; \backslash right\; \backslash vert\; \_^\; =\; -\; =\; E$ of energy. Performing positive work equal to E units of energy, we can recede objects from ''r''0 to ''r''1 special units apart. By performing positive work equal to $E\; =$ , the second term vanishes and objects are infinitely separated ($r\_1\; =\; \backslash infty$). Because gravitational force stops pulling objects together at that distance, $E\; =$ is known as gravitational binding energy, which is infinite at $r\_0\; =\; 0$ since the gravitational force is infinite there. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「gravitational energy」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.