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Near the Arctic Circle, it was the final part of the nation to be explored and settled.
VOA: special.2009.08.02
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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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because it was like the same circle of friends. So it was cool.
因为都是一个圈子里的朋友。所以真的很酷。
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Over the next ten minutes it grew into a white circle.
VOA: special.2009.07.22
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You've got to ask yourself, let the time it takes to do a full circle, that's the time period, do a full circle.
你已经问你自己了,留足够的时间让它运动一整圈,那就是运动整个圆周的时间周期
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It is a Latin word that means "ring" or "circle."
VOA: special.2009.01.11
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Go through and circle it.
大家看，把名字圈起来。
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It formed a half-circle shape of a bowl.
VOA: special.2010.01.04
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It makes sense to draw the wave function as a circle, because we do know that 1 s orbitals are spherically symmetric.
把波函数画成一个圆是有道理的，因为我们知道1s轨道是球对称的。
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"That's got to be it." "See the big circle patches?"
VOA: standard.2010.07.05
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Columbus Circle has great stores. It's fairly new, I think.
在哥伦布环岛里有很棒的商店。我认为它是相当新的。
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If you look at it long enough, it is a word that opens and spreads out, makes a circle of a far horizon, a word on which rain can fall and dimple or sweep across in lashing gusts and leave unperturbed, a word that is calm enough to look at, almost lulling, but also hints at holding unreckonable power."
VOA: standard.2010.08.04
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Take that circle and put it on your cheek.
把这个圆圈放在面颊上。
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So that a half circle, instead of calling it 180 degrees, And a quarter circle, instead of 90, It's good to know certain famous angles.
半圆,不说它是180°,四分之一圆,不叫90°,知道一些常用的角度很有必要
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I'm asking what's the tangential speed as it moves along the circle?
它在做圆周运动时,切向速度是多少
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It's going around a circle.
它沿着圆周运动
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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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At any instant, your motion, if it follows any curve, locally can be approximated as being part of some circle.
在任何时候,如果做曲线运动,都可以近似地认为是圆周的一部分
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It's related to the frequency with which you go around the circle Why is that?
它也跟圆周运动的频率有关,为什么呢
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That means the acceleration is pointing towards the center of the circle and it has a magnitude a.
也就是说加速度,始终指向圆心,其模长为 a
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If you know more than one person with the same last name, circle it twice.
如果有一个姓你认识的不止一个，那就圈两次。
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Okay. For those who have not seen a radian, it's just another way to measure angle with the understanding that a full circle, which we used to think is 360 degrees, So a radian is roughly 60 degrees.
我想告诉那些还不懂弧度制的同学,这是衡量角度的另一种方法,理解起来是这样的,对于一个整圆,也就是我们之前所说的360°,所以1弧度大约是60°
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She has heard of me, so I could circle it.
她听说过我，所以我可以把它圈起来。
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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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So we know it's moving on a circle of radius r.
因此这个质点始终在做半径为 r 的圆周运动
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Maybe you'll put a little T and circle it.
也许你要标注一个带圈的 T
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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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