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。
For the pendulum, center of mass is here.
对摆来说，重心在这里。
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