It's a physics toy that demonstrates angular momentum, potential energy, and kinetic energy.

是个物理学家的玩具可以示角动量还有动能势能。

Take quantum vortices, which are basically whirlpools of angular momentum in materials like superconductors and superfluids, giving them strange properties.

以量子涡旋为例，它基本上是超超流等材料中角动量的漩涡，使它们具有奇特的性质。

As it did, angular momentum became important.

随着它的坍缩，角动量变得重要起来。

It seems to be able to right itself by flipping in the air without pushing off anything first, which would contradict the law of conservation of angular momentum.

它似乎能够通过在空中翻转而不首先推动任何东西来调整自己，这与角动量守恒定律相矛盾。

What's neat is that they can maintain angular momentum indefinitely.

最的是它可以永久性地保持角动量。

By bending in the middle and using fast twitch muscle fibers, they can whip around without ever changing their net angular momentum.

透过在身中断弯曲并使用快肌纤维，它们可以在不改变其净角动量的情况下摆动。

Well, as a planet orbits the Sun it may not keep a constant speed but it does maintain its angular momentum.

当行星绕太阳运行时，它可能不会保持恒定的速度，但它的角动量会保持不变。

More angular momentum means she can make more turns before needing to replenish what was lost to friction.

更多的角动量意味着 她可转更多圈 ──在因摩擦力损失动量，需再补充之前。

That's called conservation of angular momentum.

这称为「角动量守恒定律」。

Angular momentum is equal to the mass of the planet times the distance of the planet to the Sun times the velocity of the planet.

角动量等于行星的质量乘以行星到太阳的距离乘以行星的速度。

Since the angular momentum doesn't change, when the distance increases the velocity has to decrease.

由于角动量不变，当距离增加时，速度就会减小。

That's called the conservation of angular momentum.

- 这就是所谓的角动量守恒。

It has lots of angular momentum  which causes it to spin.

它具有大量的角动量，这使其旋转。

Basically, an object’s angular momentum describes its tendency to stay rotating.

基本上， 物的角动量描述了它保持旋转的趋势。

Now because black holes are defined by only three  parameters: mass, charge and angular momentum, any other information about objects that  fall into the black hole appears to be erased from the universe.

现在，由于黑洞仅由三个参数定义：质量、电荷角动量，因此有关落入黑洞的物的任何其他信息似乎都从宇宙中消失了。

In order to conserve angular momentum, her angular velocity, the speed of her turn, has to increase, allowing the same amount of stored momentum to carry her through multiple turns.

为了保持角动量，她的角速度， 即旋转速度，必须增加， 使得相同的动量储备能支撑她完成多次旋转。

We could do this by throwing objects with a small mass and a lot of charge or angular momentum, so that the charge or spin increases faster than the mass.

我们可以通过投掷质量小但带电量大或角动量大的物，使得带电量或自旋增加的速度快于质量增加的速度。

The dynamics of that are sort of dissipating the angular momentum in such a way that, like, the Moon is moving away and the Earth is slowing down.

这样的动态机制会消散角动量，使得月球远离地球，而地球自转也在减速。

What if they used internal gyroscopes near their center of mass, harnessing angular momentum to orient the spacecraft, then applying bursts of thrust to accelerate!

如果它们在质心附近使用内部陀螺仪，利用角动量来调整航天器的方向，然后施加短促的推力来加速！

I get a change in angular momentum of this, solving for significant digits, I get 2.5 times 10 to the third newton meter seconds.

我得到这个角动量的变化，计算有效数字后， 结果是2.5乘以10的三次方牛米秒。