简谐振荡
We've done this before& this is the conservation of energy, and in order to find the period of the simple harmonic oscillation, we take the time derivative.
以前算过-,这是能量守恒,为了算出,简谐振荡的周期,我们求时间导数。
In the case of the spring, was proportional to x squared and out came a perfect simple harmonic oscillation, no approximation necessary.
在弹力的例子里,和x^2成比例,所以得到一个完美的,简单谐波震荡,不是非常重要。
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