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。
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.
这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。
Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.
（德国数学家）Noether所发现的是，只要在自然界呈现连续对称性（的地方），守恒定律就一定成立，反之亦然。
What Noether discovered is that whenever nature displays a continuous symmetry, a conservation law comes along for the ride, and vice versa.
这就为研究激光的工作人员出了一个难题：如果能量输出有两种形式，他们怎样运用电荷守恒和能量守恒定律呢？
This posed a conundrum for researchers working with the laser: How were they to apply the laws of conservation of charge and conservation of energy with two forms of energy output?
不知怎么的，这一定律和,角动量守恒定律有所相似。
Somehow, it has the smell of some conservation of angular momentum.
是违背守恒定律而凭空消失了吗？
因此呢，当(我们做的)实验违背了能量守恒定律的时候，我们有充分的理由来质疑它。
So when an experiment seems to violate the law of energy conservation, we are rightfully suspicious.
我们援引了摩尔分数的道尔顿定律，要服从质量守恒定律。
We invoke Dalton's Law of molar proportions, we write it subject to conservation of mass.
动量守恒定律告诉你,碰撞后速度是多少。
So the conservation of momentum tells you what the speed is after the collision.
首先，我用了机械能，守恒定律-，这里没有摩擦力-，我会向你们展示，这，和功能定理完全一致，现在你会怎么做呢？
I used first the conservation - of mechanical energy — there was no friction — and then I showed you that it's completely consistent with the work-energy theorem, so what would you do now?
让我们试着用机械能，守恒定律解答一下。
其结果，其中一些方程非常眼熟，比如动量守恒定律和牛顿第二定律。
Turns out, some of these equations were very familiar: the law of conservation of momentum, and Newton's second law of motion.
这是我们第一次，在这种系统里使用，角动量守恒定律。
Now we're going to apply for the first time in systems like this, the conservation of angular momentum.
所以你也可以用，功能定理，或者是机械能，守恒定律。
And so you could have used the work-energy theorem or you can use the conservation of mechanical energy.
要服从质量守恒定律。
我们知道，机械能守恒定律-，动能和，势能的总和。
Then we have the conservation - of mechanical energy — the sum of kinetic energy and potential energy.
他坚持认为这并非永动机，也没有违反能量守恒定律，因为驱动器和里面的微波使用不同的坐标系。
He is adamant that this is not a perpetual motion machine, and does not violate the law of conservation of momentum because different reference frames apply to the drive and the waves within it.
这就是我们即将看到的：这一点就是在Einstein的宇宙论中，守恒定律开始遇到麻烦的地方。
As we will see, this is where energy conservation may start to get in trouble in Einstein's universe.
势能的改变量，将会转化成动能的改变量，这就是能量守恒定律。
The change in potential energy is going to be the change in kinetic energy You have conservation of energy principles.
大声点。，lewin：，So, speak, up。，我们可以尝试用，机械能守恒定律吗？，这样用有什么问题吗？
LEWIN Shall we try the conservation of mechanical energy Is there anything wrong with that?
然后应用能量守恒定律去求得螺杆泵转子的设计规律。
Then, find out the design rules with the conservation law of energy.
所有这些各种各样的损耗，尽管它们数量很大，却一点也不违反能量守恒定律。
All these various losses great as they are do not in any way contradict the law of conservation of energy.
这一透彻的概括就是能量守恒定律。
This sweeping generalization is the law of conservation of energy.
本文根据质量守恒定律建立了一种配平化学反应方程序的数学模型，并给出了模型的人工解法和计算机解法。
According to conservation of mass, this article establishes a kind of mathematical model for the equation equilibrium of chemical reaction, and also gives its solution both by man and by computer.
如果宇称守恒定律受到破坏，就会取消这个限制。
If the law of parity conservation were suspended, this restriction would be removed.
还有一个更重要的事情，这些对称性暗示着大量的守恒定律。
An even more important fact is that these symmetries implicate a large number of conservation laws at the particle level.
根据质量守恒定律和果蔬采后呼吸生理，推导出薄膜气调包装(map)的数学模型。
According to the law of conservation of mass, the mathematics model of Modified-Atmosphere Packaging (MAP) is educed.
物理学的守恒定律类似于语言学规则。
In physics, conservation laws are analogous to linguistic rules.
物理学的守恒定律类似于语言学规则。
In physics, conservation laws are analogous to linguistic rules.
应用推荐