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And this is just a Newtonian expression of momentum, the product of the mass of the electron times its instant velocity.
这只是牛顿学上关于动量的表达，用电子质量,乘以瞬时速度。
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but we're hoping that the political momentum will swing back
但是我们希望政治势头能够扭转，
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And in terms of equations that we use, it's sometimes easier to plug in the fact, since momentum is equal to mass times velocity.
在我们使用方程这方面，事实上有时是很容易代入的，因为动量等于质量乘以速度。
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All right, and initially, well, maybe initially, momentum just to be simple I'm going to start false momentum equal to false.
好了，首先，为了简单起见，我会让,先等于。
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All around. If you plug in the numbers, you will end up with an uncertainty 15% in the momentum as being on the order of 15%.
所有，如果你把数字都加起来，你将得到一个关于动量的不确定度,约为。
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We are really attracted to people whose regard for us ? is gaining momentum over time. Okay?
我们会被那些越来越,看得起我们的人所吸引，是不是？
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So, the sooner you can do that, then you have a lot of momentum around it.
所以越快做到这一点，你就能有很多动力。
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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
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And that's really neat to think about, because photons, of course, are massless particles, they have no mass, so it's neat to think about something that has no mass, but that actually does have a momentum.
而且那真的不容易想明白，因为光子，当然是无质量的粒子，它们没有质量，所以这个真的不容易想明白,一些物体没有质量，但是它们事实上确实有动量。
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There are people who don't believe that, and instead argue t hat there is this notion called momentum.
有的人不相信这种说法，并且说,有一个叫做股票势头投资的东西。
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And what de Broglie said is well, if it's true that light, which has a wavelength can have momentum, then it must also be true that matter, which has momentum, also has a wavelength.
德布罗意说的是，如果光具有波长和动量是对的,那么物质具有动量和波长,也一定是对的。
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Bohr says that the energy is quantized through its angular momentum.
波尔说能量通过角动量,被量子化。
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momentum Well, the final thing I want to look at is momentum.
好了，最后我想看到的就是。
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Bohr expressed the quantum condition by the angular momentum, quantum condition in the following manner.
波尔阐明了他的量子理条件,通过角动量，和以下的量子条件进行量子化。
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And one thing that Einstein put forth is he figured if well, what we're saying is that light is, in fact, a stream of particles, each one of those particles or photons must, therefore, have a momentum.
爱因斯坦提出了一件事情,他指出如果我们所说的光，事实上是一束粒子，那么这些粒子或者光子中的，每一个都有动量。
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Bohr said that the angular momentum, mvr where n is this integer counter h over 2 pi.
波尔提及到角动量，是被量化了的，mvr，is，quantized,这里的n等于一个整数乘以h除以2π
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