So, it's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddle wheel.

好，让我们看看重物的质量,以及它下落的距离，就知道桨轮做了多少功。

麻省理工公开课 - 热力学与动力学课程节选

You adjust the lengths and when it balances, you can sort of tell what this mass is, right?

调整它与支点的距离,然后当它平衡时,你就能得到质量是多少,对吧

耶鲁公开课 - 基础物理课程节选

So, we just talked about the force law to describe the interaction between a proton and an electron. You told me that when the distance went to infinity, the force went to zero. What happens instead when the distance goes to zero? What happens to the force?

我们刚刚讨论了描述质子,和电子之间相互作用力的定律,当距离变为无穷时,力变为零，那当距离变为,零时会发生什么？,这时候力是多少？

麻省理工公开课 - 化学原理课程节选

Let's ask, what's the range? Range is that distance.

那么射程是多少,射程就是这个距离

耶鲁公开课 - 基础物理课程节选