What would our good Miss G. give to be sixty pounds lighter or to have a weight of this size as a counterbalance when she is performing her entrechats and pirouettes?

如果减轻六十磅或在她表演她不同的芭蕾舞蹈动作的时候有同样大小的助力来抵消她的重量的话，我们美丽的G女士会给出怎样的结果呢？

youdao

Weight: approximately 740 g (1.

重量：约740 g（1.6 磅）

youdao

Weight: approximately 740 g (1.6 pounds)

重量：约740 g（1.

youdao

The force, as this weight drops is constant, mgh and so the work is just going to be m g h, h where this is h.

当重物掉落时候的力是恒定的，因此做功就是，这段长度是。

麻省理工公开课 - 热力学与动力学课程节选

You can see that if a was equal to g, your downward acceleration is that of gravity, namely the cable has snapped in the elevator, Then you don't feel any weight.

你会发现如果 a 等于 g,你下降的加速度就是重力加速度,也就是电梯的绳索断了,那时你会完全失重

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