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Mendeleev is the one who taught us that the properties of the elements are a function of the atomic mass.
门捷列夫教授我们元素特性,是元素质量所起的功能。
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but they have good qualities, too. So we have to take from both sides.
但他们的质量也很好。所以我们得考虑两个方面。
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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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We have a table of the elements with properties varying periodically with atomic mass, so we compress all of that information and refer to it as the Periodic Table.
我们有一个元素表，其中的元素的特性,随着原子质量的改变而引起周期性的变化，所以我们将所有的信息精简,将它变成一个周期表。
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We could still say it's-- how good your life is, is a matter of adding up the goods and subtracting the bads.
我们可以说-,你的生活质量，等于把好事加起来再减掉坏事。
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And know intuitively that if they move together, they will behave like an object of mass 5 and the acceleration will again be 2.
凭直觉认为既然它们一起运动,那么它们就相当于一个质量为 5 千克的物体,然后我们可以算出加速度为 2
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Looking at opportunities for how we might improve education Building the things that will help students And then putting them to classroom settings.
研究我们如何能,提高教育质量,建立能帮助学生的东西,然后把它们放到课堂中应用。
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And so we know the force for a particular mass, and we know the area of the piston.
我们知道每个质量对应的力，也知道活塞的面积。
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Now how it might be able to offer some quality of life improvement for these patients.
现在，我们如何帮助这些病人,提高他们的生活质量。
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But fortunately,again,this is why positive psychology as a network of scholars applying themselves to these ideas and ideals. It's so important because today you'll see throughout the semester that there are so many more tools that we can apply to our lives, to go beyond the zero.
但幸运的是，这就是为什么要学习积极心理学,大量的学者致力于,研究这些观点，它意义非凡,因为今天你们会看到整个学期的概览,有很多方法可以让我们的生活质量，达到正值。
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And we could not preserve the quality of human life
如果不使用动物做实验，我们就难以保持人类的生活质量，
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And this spin is an intrinsic quality of the electron, it's a property that is intrinsic in all particles, just like we would say mass is intrinsic or charge is intrinsic.
自旋是电子的本征量，它是所有粒子的本征性质，就像我们说质量是本征的或者电荷是本征的。
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And I have purposely made the arrow shorter to indicate that it has been slowed because we are going to argue its mass didn't change, so the only way to change its energy is to change its velocity.
我已经故意将这个箭头弄短,用来象征它变慢了,因为我们将证明它的质量没有变，只有它的能量改变了,也就是它的速度变了。
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We invoke Dalton's Law of molar proportions, we write it subject to conservation of mass.
我们援引了摩尔分数的道尔顿定律，要服从质量守恒定律。
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I mean, the atom has a tiny mass, too, but what we are saying is compared to the totaled atomic mass, the mass of the electron is tiny.
我的意思是，原子的质量也很小，但是我们说的是,和整个原子质量相比，电子的质量是很小的。
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If we think of the size of a typical atom, we would say that would be about 10 to the negative 10 meters. So, we can see the diameter of a nucleus is absolutely smaller really concentrating that mass into a very small space.
一个普通细胞的大小，抱歉，我和细胞核搞混了0,如果我们考虑，一个普通原子的大小,这大概是10的负十次方米,所以原子核的直径确实非常小,真的是把质量。
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But he also realized that when they did hit something what they hit what unbelievably massive but also that that mass was concentrated So eventually, this is what we have come to call the nucleus of an atom.
碰到的一定是十分重的东西,而且那些质量,要聚集在非常非常小的空间内,这个就是我们称作,原子核的东西。
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Newton says F = ma, so to make it a useful result of this problem, we know the mass of this guy.
牛顿指出 F = ma,这对于解决这个问题很有用,我们知道这个物体的质量
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I mean they take up a teeny bit but essentially when we're thinking about the set up of the atom, we don't have to account for them as using up a lot of the mass we're discussing.
所以我们可以假设电子没有质量,它们占据了，非常小的一部分,所以当我们考虑,原子的构造的时候,不用考虑它们的质量。
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We can make some substitutions here using some of the derivation on the previous board which will give us the Planck constant divided by 2 pi mass of the electron times the Bohr radius.
在这里我们也可以,用我以前在黑板上写过的一些词来取代它,得到的是普朗克常数除以2π电子质量,再乘以波尔半径。
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We have not yet found a satisfactory answer to what's the mass of an object?
我们还没有一个令人满意的答案,物体的质量到底是多少
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So, that really won't do the trick in giving us the best quality pleasures of the kinds that humans most crave-- the pleasures of friendship and discussion and sexual intimacy.
那无法给与我们,人类最渴望最高质量的快乐-,友谊，讨论，性事带来的快乐。
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e We also have e, which is going to be the charge on the electron.
这是电子的质量，我们还有。
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What de Broglie is saying we can know the wavelength of any matter at all, as long as we know its mass and it's velocity.
通过德布罗意所说的,只要我们知道了,它的质量和速度，我们可以知道,任何物质的波长。
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We know there is no thing called a massless rope, but most ropes have a mass, but maybe negligible compared to the two blocks you are pulling, so we'll take the idealized limit where the mass of the rope is 0.
我们都知道无质量的绳子是不存在的,是绳子就有质量,但是相比于这两个物体就可以忽略不计了,所以我们有了这个理想的条件,即绳子的质量都是 0
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So, it's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddle wheel.
好，让我们看看重物的质量,以及它下落的距离，就知道桨轮做了多少功。
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We know now with the same spring, by this comparison, we will find all objects now can be attributed a mass.
我们现在知道利用相同的弹簧,采用这种比较的方法,就会发现,所有物体都有确定的质量
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If a photon, which has no mass, can behave as a particle --And we know this.
如果一个没有质量的光子，像粒子一样运动--，我们知道这个。
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Because it's not just information that determines our wellbeing, our success, our self-esteem, our motivational level, the relationship and the quality of our relationships.
因为信息无法决定我们的幸福感，我们的成功，自尊，动机水平，两性关系及其质量。
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We divide that by the mass, so 0.12 kilograms, that's the mass of a regulation baseball for the major leagues, and the velocity of the baseball is 42 meters per second. So, we can cross out our units doing our unit analysis.
我们用质量来除它，质量为0，12千克，这是大多数联赛规定的棒球质量,棒球的速度为42米每秒,所以，我们可以消去单位,来做单位分析。
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