Let's do an example. Let's try to figure out if we have just a uniform disk how hard it is to spin it around its center.
还是看个例子吧，有一张均匀的唱盘，让它绕中心旋转有多难呢？
because it's a unit disk. And, the center of mass is the center of a disk.
因为它是一个单位圆盘，这部分的中心就是圆盘的中心。
Erected in the center circle with a vertical bar disk.
在圆周的圆心竖一根与盘面垂直的直杆。
Erected in the center circle with a vertical bar disk.
在圆周的圆心竖一根与盘面垂直的直杆。
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