Correlation of critical mass velocity has been provided.
文中还给出了临界质量流速的试验关联式。
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。
On the basis of experiment of two-phase pressure drop, for air-water flow through horizontal tube, the effect of mass velocity on the two-phase pressure drop is analyzed.
在对空气-水在水平放置的圆管内流动时的两相压降实验的基础上，分析质量流速对两相压降的影响。
Once you have started the boulder rolling, it develops momentum, which is defined by its mass and velocity.
一旦你开始让巨石滚动，巨石就会产生动量，这是由其质量和速度决定的。
Combining the measured velocity with the relative masses, they can calculate the mass of the star directly.
结合群众的相对速度测量，可以计算出它们的质量直接明星。
What de Broglie is saying we can know the wavelength of any matter at all, as long as we know its mass and it's velocity.
通过德布罗意所说的,只要我们知道了,它的质量和速度，我们可以知道,任何物质的波长。
'the mass and velocity of the expelled gas,' he told me in an E-mail that has forever endeared him to me,.
‘所放屁的质量和速度，’在那封极其讨我欢心的邮件中，他写道，‘与人体质量相比相当之小。’
And in terms of equations that we use, it's sometimes easier to plug in the fact, since momentum is equal to mass times velocity.
在我们使用方程这方面，事实上有时是很容易代入的，因为动量等于质量乘以速度。
And I have purposely made the arrow shorter to indicate that it has been slowed because we are going to argue its mass didn't change, so the only way to change its energy is to change its velocity.
我已经故意将这个箭头弄短，用来象征它变慢了，因为我们将证明它的质量没有变，只有它的能量改变了，也就是它的速度变了。
But in recent years astronomers have used radial velocity to find or confirm a number of planets down to a few times Earth's mass.
但是，近年来天文学家通过径向速度法去发现或证实大量小到只有几倍的地球质量的行星。
That is the analog of force divided by mass equals acceleration, which is d over dt of velocity.
这个类似于，力除以质量等于加速度，就是速度对t的导数。
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。
But to get the planet's mass, astronomers normally need to follow up with time-consuming radial velocity observations at some of the planet's biggest telescopes.
但测量行星的质量，天文学家通常还需要使用地球上最大的天文望远镜，来测算径向速度的耗时。
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。
We did a demonstration there with two vibrating objects with a spring, but yet the center of mass was moving with a constant velocity.
我们做过演示的，弹簧连接两个振动物体，但是质量重心，却保持稳定速度。
They're different because they don't exist behind a screen; they're in our world, built from real physics, not simulations, they have mass and velocity and smell.
他们的与众不同之处在于他们不存在于屏幕里面，他们就活生生地存在在我们的世界里，是被真实的物体组成的，而不是模拟，他们有重量、速度和气味。
The second case, I bounce one car onto another one - which is twice the mass — - certain velocity which I don't know what it is — and now what are we going to get?
而第二个例子中，用一辆车撞另一辆，后一辆质量是它的二倍-，不知道速度多大-，现在我们得到什么？
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。
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。
In terms of momentum—mass times velocity—Google's lead indeed looks daunting.
谈到动量这个词-质量乘以速度-Google确实展现出了惊人的优势。
And another piece flies off in this direction with mass m1, with velocity v1 prime.
另一片往这个方向飞，质量为m1，速度为v1。
Suppose this particle 1 has a mass five and the velocity is one.
假设这个粒子，质量为5，速度为。
Make v2 zero, and you see exactly that you see here the same result, so this must be the velocity of the center of mass.
使v2为，你显然知道,在这里有同样的结果，它必然是重心速度。
Well, in physics, momentum is a vector, and it is a product between the mass of a particle and its velocity.
物理中，动量是矢量，它产生于,由粒子的质量与速度。
How do we calculate the velocity of the center of mass?
我们怎样计算，重心速度呢？
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。
His failings were largely due to the absence of concepts like mass, velocity, force and temperature.
它的失败主要是因为没有像质量、速度、力和温度这样的概念。
Add an instant velocity change to the rigidbody, ignoring its mass.
添加一个瞬间速率变化给刚体，忽略它的质量。
In other words, its mass must increase without limit when its velocity approaches the velocity of light.
换句话说就是，当它的速度接近于光速时，它的质量肯定无限制的增大了。
So this is the velocity of the center of mass.
这就是重心速度。
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