It's a particle of mass m and momentum p has this energy so you solve for the energy, you get two answers.
一个质量为m,动量为p的粒子,有这么大的能量,你解出能量,得到两个解
With some degree of confidence, I'm working with a reliable spring and then I will get the mass of the elephant.
这时我就对弹簧有信心了,我用的是一个可靠的弹簧,我能测出大象的质量
Mass and energy -- I'm an open system, right?
质量和能量--我是个开系,对吧?
So, let's go ahead and define our variables here, they should be familiar to us. We have the mass, first of all, me m is equal to m e, so that's the electron mass.
让我们继续定义这些常数,我们对这些应该都很熟悉了,首先,我们有质量,m等于。
Again, m is the mass of the electron.
其中,m是指电子的质量。
I'm telling you, "What's the mass of the elephant?"
我要问你,"大象的质量是多少"
So, when I divide these two numbers, I'm going to find a1 over aE is equal to mE over m, which is the one kilogram mass.
把这两个式子相除,就会发现 a1 比 aE 等于 mE 比 m,m 等于 1 千克
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