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a physics professor at the California Institute of Technology (Caltech), and for a decade he's been posting gorgeous photographs of snowflakes and a lot more on his website, SnowCrystals.com.
VOA: standard.2009.12.19
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That's because the ideas of physics don't fall into 75-minute segments and sometimes they spill over a little bit.
因为物理的知识不是死板的75分钟课程,所以我会有时候做一些微调
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It's one thing to know your place in the universe, or to know the fundamental laws of physics.
知道自己在宇宙中的位置，或知道物理的基本定律是一回事。
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And we can simplify this expression as saying negative e squared over 4 pi, epsilon nought r squared. Epsilon nought is a constant, it's something you might see in physics as well.
也会遇到它,在这里，你可以就把它,理解为一个转换系数,我们需要做的。
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Let's look at the show of hands? All right so this is the majority here. Good thing physics doesn't work on the rule of the majority otherwise we'd be in big trouble.
不可逆呢？请举手，好的,大多数人这么认为,真理并不掌握在多数人手里,否则我们就会有大麻烦了。
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So, let's give him his credit, Nobel in physics.
让我们向他崇高的敬意，诺贝尔物理学奖。
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My name's John Belcher, I'm in the Department of Physics, MIT.
我叫约翰·贝尔奇，来自麻省理工大学的物理学院。
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Some have even argued that there is an intuitive biology, a common-sense biological understanding of the world that's separate from your understanding of people and physics.
有些人甚至认为,大脑中存在着一个直觉生物学模块,这是一种与所具有的人类及物理学知识,并不相同的常识性生物学知识
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It's a problem we have dealt with in the Physics Department year after year.
这是一个我们物理系,年年都要面对的问题
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We have the pulse being slowed down and almost like a law of physics or something, now comes a reaction- now John Kander makes the music accelerate so let's watch a wonderful example of accelerando here.
这里我们听到节奏慢了下来,但是,与物理类似,反作用出现了,现在约翰·肯德尔加快了音乐的节奏,让我们看到了一个渐速音的好例子
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You've got to think about what they mean, and that's one of the best things about physics because here's a person who is not looking for anti-particles.
你得去思考它们的意义,这是物理学最美妙的地方,因为有位仁兄本不是去找反粒子的
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Secondly, the book, you can see, one of you had a book here, it's about 1,100 pages and when I learned physics it was, like, 300 pages.
第二点,教材,你们可以看到,这位同学手上就有一本,大概1100页,我当初学物理的时候,教材只有300页
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That's not how physics is done.
物理成果可不是这么做出来的
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More generally speaking, we might say, they're subject to deterministic laws... that, as physical objects, it's true of them that they must do what the laws of physics and laws of nature require that they do.
我们甚至可以这样说,它们受制于决定性的法则,即,作为物理实体,它们必须按照,物理定律和自然法则的要求去做
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So, one thing they did, because it was so easy to measure kinetic energy of electrons, is plot the frequency of the light against the kinetic energy of the electron that's coming off here. And in your notes and on these slides here, just for your reference, I'm just pointing out what's going to be predicted from classical physics.
他们做的其中一件事,因为测量电子动能是很容易的，就是画出光的频率,和出射电子动能之间的关系,在讲义的这里，仅仅是,为了做个比较，我要指出，经典物理所给出的预测,这个不作为对你们的要求。
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If you're in this state, you will necessarily, given the laws of physics and the way the computer's programmed and built and so forth, these wires will turn on, turn off, these circuits will turn on, turn off, boom, suddenly you'll be in that state.
如果你站在这个角度,你必定会考虑,在物理定律和电脑编程原理,如何构造的等等确定的情况下,这些电线通或断,这些回路通或断,嘣,突然你就处在那个位置上
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So that's what we are going to focus on, and you will find out that the laws of physics for this entire semester certainly can be written on one of those blackboards or even half of those blackboards.
这就是我们的课程重点,而且你将来会发现,整个学期的全部物理定律,最多也只能写满一块黑板,或者半块黑板
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I can change everything overnight; it does happen. I put that in for a reason because sometimes some of you have not taken a physics course and you don't know how to do well in physics and slowly you catch on and by the time it's Final exam you crack the code; you know how to do well.
我能一夜之间扭转乾坤,确实有过这样的例子,我这样做是因为,有时你们中有人可能以前没上过物理课,不知道怎样学好物理,但慢慢地你赶了上来,到期末考试的时候,你忽然灵光一闪,考起试来得心应手
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That's what we're doing in physics.
这便是我们在物理上所做的。
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Now let's look at the physics.
现在我们来研究一下物理学原理。
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