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- Part of the challenge is speed, too, how quickly you can get these answers in terms of getting them in on time.
部分困难也会来自于速度，你多快能做出答案,能否在规定的时间做完。
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And so when you actually have a device the bits don't flow at the speed of light in reality.
因此，当你拥有一个设备,数据位并不能以现实中的光速传输。
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I have shown you yesterday that the speed of the particle as it goes around the circle is this .
我昨天讲过,质点做圆周运动的速率等于这个
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You do it so quickly that the heat flow between the inside of the bicycle pump and the outside is too slow compared to the speed at which you compress.
我们用力很大,于是压缩得很快,打气筒内外热传递的速度,与之相比要慢得多。
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And, you know acceleration means either change of speed or change of direction.
你知道加速度意味着,不是改变速度就是改变方向。
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And you can hear them together, Yeats moving from one to another with, oh, incredible speed and agility in that final strophe of the poem, on the next page.
而你可以听出所有，在诗的第三节中，叶芝转换得很快,很敏捷，翻到下一页。
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And you can vary the width and the speed and the length.
你能改变它们的广度,速度和长度
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No, and speed is what you want.
不行,可你想要跑得越快越好
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c We know it's very specific for light because in this equation is c, the speed of light. So any time you go to use this equation, if you're trying to use it for an electron, just ask yourself first, does an electron travel at the speed of light?
我们知道它只对光适用是因为在这个方程里有,光速，所以下次你们用这个方程前，如果你们要把它用到一个电子上，先问问你自己，电子的运动速度是光速吗？
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And if you are looking at a keyboard, we can predict in the real time very rapidly that beat your very single finger typing speed, exactly the letters you like to type and hit, therefore provide a communication mechanism that Christopher Reeve and those similar with him can benefit from.
如果你在看电脑键盘，你可以十分快速地,实时预知自己手指敲击键盘的速度，预知你想录入的字母，这样便为克里斯托弗·里夫,和其他你说熟悉的人提供了一种沟通机制，使他们从中受益。
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Speed, right. So another decision you face is do you just try and kick this ball as hard as you can or do you try and place it?
球速是正解,你还需要考虑,当你主罚点球时你是大力抽射,还是小力轻擦
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because you need to know like, how fast the shutter speed and all that stuff,
因为你必须知道，像快门的速度，还有其他这一类东西，
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Sometimes they give you the speed in miles per hour, kilometers per year, pounds per square foot.
有时候速度的单位是英里/小时,千米/年,英磅/平方米
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It means, when you are accelerating upwards, as the elevator picks up speed, the reading on the spring will be more and you will feel heavy.
也就是说当你向上做加速运动时,就像电梯加速的时候,弹簧的读数会增大,你会觉得自己变重了
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So, when I threw that thing up and you caught it, what you are doing mentally was immediately figuring out where it started and at what speed.
所以当你接住我抛出的物体时,你大脑里的反应就是,立刻弄清它的初位置以及初速度
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Another thing you can do is you can find the speed here.
你能做的另一件事就是你可以求出这里的速度
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Can you make much speed that way?
你能跑得快吗
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You put a chunk of wood on a table and you try to move it at constant speed.
你把一大块木头放在桌子上,试着让它匀速运动
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You see how long you are in the air and the whole time you are in the air, you are traveling horizontally at this speed.
你可以知道在空中停留的时间,当你在空中运动的时候,你一直以这个水平速度在运动
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I want you to find the speed so it will land here.
我希望你们求出初速度,使它落在这儿
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A clock tells you what time it is, but you can also say what time it is by seeing how fast the particle is moving because you know it started with some speed.
时钟能告诉你现在的时间,但你也可以通过测量质点速度,来判断当前的时间,因为你知道它的初速度
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If you're a doctor and you've got a patient who's running away from you at the speed of light, you'll know what to do.
如果你是个医生,你的一个病人以光速逃跑了,你就知道该怎么办了
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You shoot something, you should know when it will land, where it will land, with what speed it will land, how high it will go.
抛出一个物体,我们要知道落地时间,落地位置,还有落地的速度,最高点的高度
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So, you picked up some speed, then you're coasting along at a steady speed.
所以当你加到一定速度,然后你便匀速上升的时候
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The fact that you don't need a force for it to move forever at a given speed in a given direction, that's not obvious, because in daily life you don't see that.
对于物体不需要力的作用就能保持,确定的速度和方向持续运动这一事实,它并非显而易见,因为在日常生活中你看不到这种情况
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What it means is if you'd release a rock at that location one second before with a certain speed that we can calculate, it would've ended up here with precisely the position and velocity it had at the beginning of our experiment.
它的意义在于,若在该处以特定速度抛出一个物体,这个速度可通过计算得到,一秒之后,物体会运动至我们设定的起点,并且速度为我们设定的初速度
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If you want to find the speed there, you put the equation v^=v0^-2g.
如果你想求出那一点的速度,可利用方程v^=v0^-2g
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