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Delta-v (physics)
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・ Delta12-fatty-acid desaturase


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Delta-v (physics) : ウィキペディア英語版
Delta-v (physics)

In general physics, delta-''v'' is simply a change in velocity. The Greek uppercase letter delta is the standard mathematical symbol to represent change in some quantity.
Depending on the situation, delta-''v'' can be either a spatial vector (Δv) or scalar (Δ''v''). In either case it is equal to the acceleration (vector or scalar) integrated over time:
:\Delta \mathbf = \mathbf_1 - \mathbf_0 = \int^_ \mathbf \, dt (vector version)
:\Delta = _1 - _0 = \int^_ \, dt (scalar version)
where:
*v0 or ''v''0 is initial velocity (at time ''t''0),
*v1 or ''v''1 is subsequent velocity (at time ''t''1).
Change in velocity is useful in many cases, such as determining the change in momentum, where :\Delta}, where ,\mathbf is momentum and m is mass.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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