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SAT2物理常用术语词汇整理(V)

来源:  日期:2014-01-24 16:20  阅读 184 次  作者:   划词  进入论坛  投稿

 V

Vector
A vector quantity, or vector, is an object possessing, and fully described by, a magnitude and a direction. Graphically a vector is depicted as an arrow with its magnitude given by the length of the arrow and its direction given by where the arrow is pointing.
Velocity
A vector quantity defined as the rate of change of the displacement vector with time. It is to be contrasted with speed, which is a scalar quantity for which no direction is specified.
Vertex
The center of a mirror or lens.
Virtual image
An image created by a mirror or lens in such a way that light does not actually come from where the image appears to be.

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