There is another thing that we know because if a force derives from a potential 0 then that means its curl is zero Thats the criterion we have seen for a vector field to derive from a potential.

我们还知道,如果力是由势产生的,那么其旋度是,这就是我们得到的,关于从势产生的向量场的准则。

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It can detect pressure from 0 to 15 kilopascals, which is the range of force required from typing to holding something in your hand.

加里福尼亚大学伯克利分校研究人员说，电子皮肤可觉察0—15千帕的压力，其范围从打字到手握物体所需的力。

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Surprisingly, last does not force a clear to reposition any elements that follow; it merely sets the right margin to 0, which overrides the default right margin of 10 pixels in span-n.

令人惊讶的是，last并未明确强制重新配置其后的任何元素；它仅仅将右边距设置为0，这将覆盖span - n中10像素的默认右边距设置。

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So, let's think qualitatively for a second about what that means or what the real meaning of that is. What that is telling us is that according to Newtonian mechanics and Coulomb's force law, is that the electron should actually plummet into the nucleus in 0.1 nanoseconds.

让我们定性的想想,这意味着什么,这告诉我们,根据牛顿力学,和库仑定律，电子,在0。1纳秒内,就会掉到原子核里面。

麻省理工公开课 - 化学原理课程节选

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