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In other words, you don't have to be moving actually in a circle to have the acceleration.
也就是说,你不必真的在一个圆上运动以获得相应的加速度
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Suppose the particle is not moving in a circle, but does this.
假设这个质点不是做圆周运动,而是这样
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And that's what Neal Cassady was to them at first, a kind of wanderer who wanted to be in their intellectual, but bohemian, circle.
刚开始时尼尔卡萨迪对他们就是这样，想要进入他们这个既有高才智，又放荡不羁的圈子的流浪汉。
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So, actually I want you to go ahead in your notes and circle that zero point and write "not a node."
在你们笔记上把这个零点圈出来,在旁边写上“不是节点“,它不是节点“
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Now to start with, the plasmid is usually shown in a diagram like this as a circle.
首先要说的是,质粒通常用图中这个环形来表示
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A circle, in other words, is not necessarily a vicious circle.
循环并不一定是恶性循环。
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So, we are talking about a wealthy group, and of course, the thing that struck Schliemann almost amazingly was that in the circle of graves that we've been talking about, he found all kinds of precious things buried.
所以,我们所谈论的是一个富有的群体,当然,令谢里曼为之震惊的是,在这些墓葬圈之中,正如刚才提到的,他找到了品目繁多的奇珍异宝
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This describes a particle that's going around in a circle.
这个式子描述了质点的圆周运动
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The fact that when you go in a circle, you accelerate is what we're learning here, coming from the fact that velocity is a vector and its change can be due to change in the magnitude or change in direction.
而当你做圆周运动时你也在加速,这是我们在这里所学到的,原因就在于,速度是一个矢量,其变化可以通过改变模长,或者方向来实现
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When a particle moves in a circle, it has an acceleration towards the center of this size, v^2 over R.
当一个质点在圆周上运动时,它有一个指向圆心的加速度,v^2 / R
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That means, it can only be rattling around in a circle of radius R.
也就是说它只能,限制在一个半径为 R 的圆上运动
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Whenever you see a particle moving in a circle, even if it's at a constant speed, it has an acceleration, v square over r directed towards the center.
只要看到质点做圆周运动,即使是匀速圆周运动,也存在一个加速度,大小为 v^2 / r,方向指向圆心
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It poses other kinds of difficulty, let's say; but in the case of fiction, in order to be engaged, in order to enter the hermeneutic circle properly, we need the element of surprise, as I say, as a way of distinguishing between fiction and nonfiction.
它的确带来了其它困难，我们可以这样说;,但是在读文学时，为了投入进去，为了合适地进入解释循环，我们需要“惊讶“这个元素，正如我所说，作为区分文学和非文学的一点。
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So in hydrogen atom a, I'll depict that here where the nucleus is this dot, and then the circle is what I'm depicting as the wave function.
在氢原子A里，我在这里把原子核画成一个点，这圆就是波函数。
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We're describing the motion of a particle in a circle.
我们描述了圆周上一个点的运动
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It tells you when a particle moves in a circle, it has an acceleration in a negative R direction, namely directed towards the center.
它告诉你当一个物体在圆周上运动时,它有一个在 -R 方向的加速度,也就是说是直接指向圆心的
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If it's going in a circle, you will say from now on, that it, indeed, has an acceleration, even though no one's stepping on the accelerator, of amount v^2 over R.
如果它在一个圆周上运动,你会说从现在起它其实有加速度,即使没有人去踩油门,加速度大小为 v^2 / R
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We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.
我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1
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