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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 Particle acceleration ： ウィキペディア英語版 Particle acceleration In a compressible sound transmission medium - mainly air - air particles get an accelerated motion: the particle acceleration or sound acceleration with the symbol a in metre/second². In acoustics or physics, acceleration (symbol: ''a'') is defined as the rate of change (or time derivative) of velocity. It is thus a vector quantity with dimension length/time². In SI units, this is m/s². To accelerate an object (air particle) is to change its velocity over a period. Acceleration is defined technically as "the rate of change of velocity of an object with respect to time" and is given by the equation :$$ \mathbf = where *''a'' is the acceleration vector *''v'' is the velocity vector expressed in m/s *''t'' is time expressed in seconds. This equation gives ''a'' the units of m/(s·s), or m/s² (read as "metres per second per second", or "metres per second squared"). An alternative equation is: :$$ \mathbf - \mathbf \over t} where :$\backslash mathbf$ is the initial velocity (m/s) $\backslash mathbf$ is the final velocity (m/s) $t$ is the time interval (s) Transverse acceleration (perpendicular to velocity) causes change in direction. If it is constant in magnitude and changing in direction with the velocity, we get a circular motion. For this centripetal acceleration we have :$\backslash mathbf\; =\; -\; \backslash frac\; \backslash frac\; =\; -\; \backslash omega^2\; \backslash mathbf$ One common unit of acceleration is ''g-force'', one ''g'' being the acceleration caused by the gravity of Earth. In classical mechanics, acceleration $a\; \backslash$ is related to force $F\; \backslash$ and mass $m\; \backslash$ (assumed to be constant) by way of Newton's second law: :$$ F = m \cdot a == Equations in terms of other measurements == The Particle acceleration of the air particles ''a'' in m/s² of a plain sound wave is: :$$ a = \delta \cdot \omega^2 = v \cdot \omega = \frac = \omega \sqrt \frac = \omega \sqrt \frac = \omega \sqrt \frac 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「Particle acceleration」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.