For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement.
例如，无论一个舞者多么想要跳离地板，然后开始旋转，角动量守恒定律绝对阻止这样的动作。
Angular momentum is pointing straight at me, away from you.
角动量直接指向我，远离你们的方向。
Somehow, it has the smell of some conservation of angular momentum.
不知怎么的，这一定律和,角动量守恒定律有所相似。
In motions of rotation angular momentum appears in much the same way as linear momentum appears in motion of translation.
在旋转运动中的角动量产生的方式与平移运动中的线动量的产生是基本相似的。
The researchers calculated how this would affect the rotation rate of the whole planet, which would compensate to conserve angular momentum.
研究人员计算出这会怎样影响整个地球自转速度，这有助于保持角动量守恒。
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。
If the physics seems a bit arcane, consider that you probably spent much of the past two weeks seeing the angular-momentum principle in action — at least if you watched the Olympics.
如果从物理学角度来讲解释这些原理有点晦涩难懂，那么在过去的两周内也许你也花费了大量的时间观看了角动量原则的实际演示--至少如果你观看了冬奥会比赛。
What is the magnitude of that angular momentum?
角动量的，数值是多少？
The spin angular momentum is now in this direction, so I'm going to give it a torque like so.
旋转的角动量现在是这个,方向的，我给它一个这样的力。
Now we're going to apply for the first time in systems like this, the conservation of angular momentum.
这是我们第一次，在这种系统里使用，角动量守恒定律。
I'll give it a little bit more spin angular momentum, so now I move my left hand towards me and my...
我再给它多一点的角动量，现在我将我的左手朝我移动。
Angular momentum is conserved about this point Q, but only about that point Q.
角动量，在点Q守恒，也只有在点Q守恒。
So, for two skaters of the same mass rotating at the same speed, the one with its mass more extended in space will have the greater angular momentum.
因此，对于以相同速度旋转的两个同质量选手来说，肢体在空间中更为外扩的那个选手将具备更大的角动量。
It describes the angular momentum of the electron.
它描述的是，电子的叫角动量。
According to the theory of general relativity, the speed and angular momentum of such a large spinning body twists the space and time around it in a process called frame-dragging.
根据爱因斯坦的广义相对论，像银河系这样的巨大自旋物体的速率和角动量在一个称为框架牵引的过程中会扭曲周围的时空。
And now the angular momentum is rotating like this, is pointing here.
现在的角动量是像这样，转动的，指向这。
Why? Because it has angular momentum.
为什么，因为有了一个角动量。
You give it spin angular momentum, it becomes stable.
有了一个旋转的角动量，就变得稳定。
So spin angular momentum has the property of stabilizing things.
旋转的角动量有，稳定事物的性质。
What will the angular momentum vector do?
角动量的矢量会怎样呢？
What will the spin angular momentum do?
旋转的角动量会怎样呢？
Spin angular momentum will start to chase the torque.
旋转的角动量会开始，跟随那个力。
That's immediate consequence of the conservation of angular momentum.
这是角动量守恒的，立竿见影的效果。
That's a spin angular momentum.
那是旋转的角动量。
And as long as I torque it like this, that spin angular momentum wants to go around in the horizontal plane.
只要我这样使力，旋转的角动量就是想要，水平的转动。
That makes sense to me because the torque is persuading the angular momentum to follow it.
我觉得是对的，因为力是，使得角动量跟随它的。
So the torque will also change direction and so this angular momentum, spin angular momentum will keep chasing the torque and start to rotate freely.
所以力也会改变方向,这个角动量，角动量会保持追着力,并开始自由地转动。
Bohr says that the energy is quantized through its angular momentum.
波尔说能量通过角动量，被量子化。
Bohr says that the energy is quantized through its angular momentum.
波尔说能量通过角动量，被量子化。
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