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| apparent wind ： ウィキペディア英語版 |
apparent wind
Apparent wind is the wind experienced by a moving object.
==Definition of apparent wind==
The ''Apparent wind'' is the wind experienced by an observer in motion and is the relative velocity of the wind in relation to the observer.
''Apparent wind'' velocity is the vector sum of the ''true wind'' and the headwind an object would experience in still air. The headwind velocity in still air is inverse of the object's velocity, therefore the apparent wind can also be defined as a vector subtraction: the ''Velocity of the wind minus the Velocity of the object''.
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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