If I make the total energy positive, it's not an ellipse.
如果我让总能量为正，它就不是一个椭圆了。
Total energy must be conserved.
总能量必须是守恒的。
系统有一个总能量。
What is the total energy of the Earth around the sun?
地球绕太阳，所做的总功是多少呢？
If the total energy is positive, the orbit is not bound.
如果总能量为正，轨道就不规则了。
And so this is the total energy, and this is now a constant.
所以这是总功，这是不变的。
Let this represent the total energy of the incident electron.
让这个来表示入射电子的，总能量。
Renewables will only make up 15 percent of total energy by 2020.
可再生能源在2020年只能达到总需求的15%。
Coal currently provides about 28% of the world's total energy use.
现在全世界能源消耗总量的28%由燃煤提供。
I'm going to write down the conservation of total energy, mechanical energy.
我要写下整体的，能量守恒，机械能。
About 56 percent of total energy use comes from traditional biomass-mostly firewood.
根据该手册，全部能源利用的大约56%来自传统的生物原料—大多数是木柴。
Industry consumes about 32 percent of total energy, and that share is projected to grow.
工业大约耗费全部能源的32%，这个比例预计还会扩大。
Of course, if I make the total energy positive, it's not an ellipse, so then it's all over.
当然，如果我让总能量,为正，这就不是椭圆了，所以，都可以迎刃而解了。
So the kinetic energy has increased; the potential energy is the same, so the total energy is up.
所以动能增加，势能不变，所以总能量增加。
So even in the high temperature limit, we don't have them, there's not a maximum total energy.
以在高温极限下，我们没有他们，没有最大温度。
And therefore, the total energy now is larger than the total energy that I had in my circular orbit.
因此，现在的，总能量比，在圆形轨道中要大。
The total energy doesn't depend on any interaction between this molecule and its neighbor somewhere else.
总能量不依赖于,任何相互作用，在这个分子和,它在其他地方的相邻分子之间的。
Personally I think we could reach the target of having renewables provide 20% of total energy consumption.
而我个人认为，我们可以达到(可再生能源占)总能源消耗20%的目标。
For ten years, spending on this program increased annually, and annual total energy consumption declined.
在开始的十年，在这项措施上的支出每年都在增加，而每年的总用电量下降了。
In Britain, nuclear power stations provide 19% of our electricity and account for 3.5% of our total energy use.
在英国，核电站提供了19%的电力，占总能源使用的3.5%。
According to the report, in Sub-Saharan Africa, 56 percent of total energy use comes from traditional biomass.
报告称，在南撒哈拉非洲地区，传统生物能利用量占能源总利用量的56%。
In other words, the same proportion of the total energy will be lost for a power-hungry plasma TV as for a tiny PDA.
换句话说，不管是高能耗的等离子电视机，还是小小的PDA，传输所损失的能量占总能量的比例是相同的。
More than 6% of Colorado's total energy output is from alternative resources, the eighth best rating in the country.
超过科罗拉多州超过百分之六的能源输出来自替代能源，此项排名第八。
We have defined potential energy 0 to be zero at infinity, and that is why all bound orbits have negative total energy.
我们规定，无限大时,势能为，这就是为什么所有的,规则轨道总能量为负。
Converting only 2.5 percent of that radiation into electricity would match the nation's total energy consumption in 2006.
只要将这些辐射中的百分制二点五转化成电能就可以满足一个国家在2006年的全部的能源消耗。
Depending on a plant's design, the new membranes could reduce total energy consumption by as much as 20%, reckons Dr Hoek.
根据工厂的设计，这种新型薄膜可以把总耗能降低20%，Hoek博士估算。
I mean we can, we can sort of understand why OK, the total energy, if we measure it, we measure a process which is not reversible.
例如我们易于理解为什么，当试图测量一个不可逆系统的总能量，给出的或许。
If the total energy when you leave the Earth with that velocity 0 if the total energy is larger than zero, you do better than that.
如果当你以那速度，离开地球的总能量，大于，对你就更容易了。
If the total energy when you leave the Earth with that velocity 0 if the total energy is larger than zero, you do better than that.
如果当你以那速度，离开地球的总能量，大于，对你就更容易了。
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