我们可以从这两个引擎得到的总功一定是零。
The total work that we can get out must be zero, out of the two engines.
这是一个很简单的问题，通过观察重量是多少以及它下降了多远，来确定桨轮做了多少功。
It's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddlewheel.
为了帮你起步，我们请了5位成功作家来揭示一些诀窍。
To get you started, we have asked five successful writers to reveal some of the tricks of the trade.
丘吉尔成为了一位成功的政治家和作家。
有一次，一位成功的商人应邀接受电视采访。
Once a successful businessman was invited to a TV interview.
然而，这一点点成功，却导致了问题的产生。
This bit of success, however, was the point where my problem began.
许多年后，丘吉尔已经是一位成功的政治家兼作家。
Many years later, Churchill was already a successful politician and writer.
除了诗歌方面的成就，余还是一位成功的翻译家、散文作家和评论家。
Besides his achievements in poems, Yu was also a successful translator, essay writer and critic.
一天，一位成功的商人打开在车门时，一只睡在他车底下的狗突然跑出来咬了他的腿！
One day, when a successful businessman opened the door of his car, a dog sleeping under his car suddenly came out and bit his leg!
这一成功也使嫦娥五号成为自1976年俄罗斯飞船将170.1克样本带回地球以来，第一个从月球带回样本的航天器。
The success has also made Chang'e-5 the first spacecraft to bring back samples from the moon since 1976 when a Russian spaceship brought back 170.1 grams of samples to the earth.
凯瑟琳的父亲曾是一位成功的投资银行家。
Katharine's father used to be a successful investment banker.
他们必须在产业链中赢得一席之地，而那一成功将受到业内其他企业的密切关注。
They have to earn their slot in the chain, and that success will be closely watched by the rest of the industry.
旧金山一位成功的应用软件开发者李梦说：“我以前工作非常努力。我喜欢创造东西，让它们成长并解决问题。“
"I used to work very hard. I love to create things, grow them and solve problems," said Meng Li, a successful app developer in San Francisco.
那些演讲进一步激发了这位年轻化学家的热情，他后来继续进入了皇家化学学院，于1853年成功入学，当时他15岁。
Those speeches fired the young chemist's enthusiasm further, and he later went on to attend the Royal College of Chemistry, which he succeeded in entering in 1853, at the age of 15.
所以摩擦力做负功-，转化成热能。
液体从这里到这里，做了多少功呢？
How much work do you have to do to take this liquid and put it there?
然后计算，沿此路径所做的功。
And then we had to evaluate the line integral for the work done along this path.
因此输出最大的功要求，有最大的热。
我们知道，这样的话得到的功会变少。
Now we know we're going to get less work out of it in that case.
在实际中，我们定义，效率为热与功的比值。
And in practical terms, we can define the efficiency as the ratio of the heat in to the work out.
不过，大部分患者大便功得以改善。
Bowel function, however, was improved in the majority of patients.
做任何事情都要从基本功开始。
焦耳的想法是，重力对水，做了功。
And the idea was that gravity did work on the water and falling, and that work led to the generation of heat.
毕竟我们学的这些，是来理解力和力所做的功。
Because, after all, how we got to this was coming from and trying to understand forces and the work they do.
当物体从A到，重力做的功为。
B Well, when it goes from a to b, -mgh1 the work done by gravity is minus mgh1.
如果我把我的手提包，举到这里，我做了正功。
If I take my briefcase and I bring it up here, I've done positive work.
这大约是我的体重，我走三遍楼梯，做了多少功呢？
It's about my mass. How much work do I do when I do that three times...?
毕竟，我们利用，右边产生的功，来驱动左边的热机。
After all, we're taking the output work that we get from the right, and using it all to drive the left.
这些管理学教育界的巨头们实在是徒劳微功。
The giants of management education have laboured mightily to bring forth a molehill.
通常棒子会变热，你做的功，变成热能，导致棒子的变形。
And in general the rod gets hot, and the work that you have done goes into heat and goes into the deformation of the rod.
应用推荐