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一、虚设物理对象例1有一块半径R=45cm的均匀薄铜板,现从铜板上挖出一个半径r=22.5cm的内切薄铜板,如图1所示.求剩余部分的重心与大圆心的距离.
First, the virtual physical object Example 1 has a uniform thickness of R = 45cm thin copper plate, is now digging from the copper plate with a radius of r = 22.5cm of inscribed thin copper plate, as shown in Figure 1. The remaining part of the center of gravity and large circle distance.