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。
The wake of a hovering rufous hummingbird. 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。
Yellow vectors show air velocity, revealed by particle image velocimetry.
物理中，动量是矢量，它产生于,由粒子的质量与速度。
Well, in physics, momentum is a vector, and it is a product between the mass of a particle and its velocity.
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