What is the velocity of this particle?

那么粒子的速度又是多少？

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The wake of a hovering rufous hummingbird. Yellow vectors show air velocity, revealed by particle image velocimetry.

棕煌蜂鸟悬停时引发的尾流。黄色的矢量位点是通过粒子图像测速技术显现的气流速度。

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Yellow vectors show air velocity, revealed by particle image velocimetry.

黄色的矢量位点是通过粒子图像测速技术显现的气流速度。

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If I gave you the location of a particle as a function of time, you can find the velocity by taking derivatives.

如果我给出物体的位移是时间的函数,你可以通过求导来得到速度

耶鲁公开课 - 基础物理课程节选

Because any velocity I ascribe to a particle or an object, you will add a certain constant to it by the law of composition of velocity.

因为我描述的任何一个质点或者物体的速度,你都要根据速度叠加法则,给它加上某个常数

耶鲁公开课 - 基础物理课程节选

And since we are not expecting the mass of the particle to change, what we really are saying is the uncertainty in its velocity times the uncertainty in its position is greater than the ratio of the Planck constant divided by 2 pi.

因为我们不期望,粒子质量发生变化，我们说的是,它速度的不确定度,乘以它位置的不确定度,比普朗克常量,除以2除以圆周率要大。

麻省理工公开课 - 固态化学导论课程节选

The angle of the radiation a particle gives off reveals its velocity.

ECONOMIST: How to build a B-factory

For such a particle, it is possible to work out its velocity (from the time taken to pass between the two layers) and its trajectory (from the relative positions of the elements triggered in each sensor layer).

ECONOMIST: Orbital debris

In this case, the signal is a particle's momentum that is its mass times its velocity.

ECONOMIST: How to build a B-factory