We want to know what the velocity is of the center of mass of the other one.
我们想知道，质量重心的速度是多少，对于另一个。
And, now, I think I know just by looking at the picture where the center of mass of this circle will be, right?
这样的话靠观察这张图片,圆的中心在哪就可以知道？
As another example the center of mass of the earth and moon moves in an approximately circular orbit around the sun.
作为另一个例子，地球和月亮的质心就是在一个绕太阳的近似的圆轨道上运行。
Measure throwing velocity from the center of mass of where the user feels the center of mass is — i. e. , the controller.
测量用户感觉的质心位置的质心投掷速度——也就是控制器。
Ten kilograms is ten meters below the rope, so clearly the center of mass of the system as a whole will be below the rope.
绳子下方10米10公斤，所以很明显，重心，将会在绳子下方。
The King's Chamber is not the center of mass of the Great Pyramid, rather it is where the primary energetic vortex is centered.
国王的墓室并不是大金字塔的质量中心，而是最初的能量漩涡的中心。
Geocenter motion is the relative displacement from the center of mass of Earth to the origin of the Terrestrial Reference Frame.
地球质心(简称地心)是指包括海洋大气等的整个地球的质量中心，地心运动是地球质量中心相对于地球参考框架原点的位移。
The center of mass of a system is defined as follows: I have here some kind of an object not just a point mass, but it has a finite size.
系统的重心,是这样定义的：,我有一个物体,不是有棱角的物体，但它大小有限。
The way you bridge the physical weight to the virtual is to use the center of mass of the physical controller to determine in-game velocity.
将物理重量桥接到虚拟对象上是通过物理控制器的重心来确定游戏中的速度的。
If you have a problem asking you to find the center of mass of something and you have no information about the density, assume it is uniform.
如果一个问题，需要知道某物的重心，而又不知道其密度，就可以假设它是个常数。
When you pick up a virtual object, the center of mass of that object and the center of mass you feel in your hand have some real separation.
当你拾起一个虚拟的物体，物体的质心和质心在手上的感觉有些分离。
Because when you stick your leg out in front of you, you actually decelerate, from the time it takes the center of mass of your body to get over your foot.
因为当你在将腿伸出到前方时，从你身体重心要赶上双脚所花费的时间来看，你其实是在减慢速度。
For side or front thrusters, use 2 to 4 thrusters per side (not set in stone), remember to place them more or less symmetrically compared to the center of mass of the ship.
对于侧推进器或前推进器，每边使用2- 4个推进器(可以改变)，记住：放置位置尽量与飞船质心相对称。
These calculations also help scientists determine the mass of black holes, which lie at the center of nearly all galaxies.
这些计算也可以帮助科学家们确定几乎所有星系中心的黑洞质量。
And I had no idea that Dafen's artist colony - the world's leading center for mass-produced artwork and knockoffs of masterpieces - had been devastated by the bursting of the U.S. housing bubble.
我也没有想到，美国房市泡沫的破裂会让这个美术家聚集地——大芬村是全球最重要的工艺品和名作仿制品批量生产基地——遭遇灭顶之灾。
The velocity of the center of mass has not changed as seen from your frame of reference, because the velocity of center of mass is always the same, remember, because momentum is conserved.
质量重心的速度，并没有发生改变，你在参照系中可以看出，因为质量重心的速度，总是保持不变，要记住，由于动量守恒。
Often some sort of competency center is a good approach to building a critical mass of the appropriate skills.
某种形式的能力认证中心通常是建立大量急需合适技能的好途径。
And that's exactly what you see comes out of these equations whether you go to the center of mass or whether you do it from 26.100.
这就是你们看到的，从这两个方程里得到的，无论是质量重心，还是在26。100做实验。
The amount of angular momentum, say, a spinning skater has depends on both the speed of rotation, and the weight and distribution of mass around the center.
角动量的大小，取决于旋转中的滑冰选手的旋转速度、体重和绕旋转中心的质量分布。
But the basic idea is, then, that the center of mass will always in stable configuration line itself up below the point of suspension.
但是基本概念是，物体的重心将一直，处于稳定的结构线上，在悬挂点下面。
If I throw up a hammer, then the center of mass and only the center of mass will just go along a perfect parabola as if it were just a tennis ball.
我若是抛铁锤，那么质量重心，也是唯一的质量重心，会沿完美抛物线运动，就像一颗网球。
And ultraviolet light will interact with that little ball, the center of mass, and when I then make it dark, you will only see the motion of the center of mass.
这紫外线光可以，与小球互动，也就是质量重心，当周围暗下来，能看到质量重心运动。
So to get into the center-of-mass frame, you must subtract the velocity of the center of mass from the initial velocities.
要进入重心体系，你就必须减去速度，重心的速度，从原始速度中减去。
Whether you stay in your reference frame or in the reference frame of the center of mass, it's immediately obvious that all the kinetic energy is lost.
无论你在对照系中，还是在质量重心体系，很显然，所有的动能都被损耗了。
This, by the way — - it's not so obvious — is also the velocity of the center of mass.
顺便提一下-，这并不明显-，它也是质量重心的速度。
If you have a car or if you have an object like this, then it is, of course, much harder to calculate the center of mass.
若是车或类似的东西，那么它当然会，很难计算质量中心。
In the absence of any net external forces - on a system as a whole — - as we discussed last time — the center of mass will always have the same velocity.
在没有外力，作用于整个系统时-，我们上次讨论过-，重心总是，有相同稳定的速度。
If you ever want to move yourself to the center of mass, you will have to know what the center-of-mass velocity is.
你若想要移动，在重心体系中，你就必须知道，重心速度是多少。
So I mentioned to you that the motion of the center of mass is very uniform in the absence of external forces, and that I can demonstrate for you again with the air track.
我向你们提到过,重心的运动是稳定的,若不受外力，我可以再次演示,在空气轨上。
So now we're going to turn off the lights and I want to show you the motion of the center of mass.
我们要关上灯，我想给你们展示，质量重心的运动。
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