... 解放初这个工厂是个烂摊子 the beginning of liberation the factory was an awful mess 摆体 pendulum mass 摆头电扇 oscillating fan ...
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mass pendulum 质量摆
variable mass pendulum 变质量单摆
suspended mass pendulum 悬挂质量摆
suspension-mass pendulum 悬吊质量摆
The point: that a period of a pendulum is independent of the mass - the steel ball, plus one professor - hanging from it.
目的是证明：钟摆周期和质量无关—那个铁球的，以及挂在上面的那个物理教授的。
It is a pendulum which is 5.1 meters long, and there is a mass at the end of it which is 15 kilograms.
这是个，5。1米长的钟摆，在末端，有一个重物，重15公斤。
If I double the mass of my Bob at the end of a pendulum, then the vertical component of the tension will also double.
如果把钟摆末端，物体重量加倍，那么张力的垂直分力，也会加倍。
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