能量法求固有频率的问题
看William T.Thomson的《振动理论及应用》中关于图中系统的势能分析有这样的说明，"the loss of potential energy of m due to position r1theta is canceled by the work done by the equilibrium force of the spring in the posistion theta=0"，请问怎么理解啊？ 由于r1的转动导致的质量块m的位能的和弹簧平衡力（theta=0）所做的功抵消
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