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。

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.

youdao

我向你们提过的最，惊奇的东西之一就是，振荡的周期，和物体的质量，毫无关系。

One of the most remarkable things I just mentioned to you is that the period of the oscillations is independent of the mass of the object.

youdao

如果在上面,悬挂1公斤物质，我能够计算出,振荡的周期，1除以周期,等于频率，我相信,等于大概38赫兹。

So if now I hang on it a mass of one kilogram, I can calculate the period of one oscillation, and one over the period F is the frequency F, and I believe that is something like 38 hertz.

youdao