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• A dynamo transforms mechanical energy into electricity.

发电机使机械能转换为

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• We didn't even talk about it when we did the conservation of mechanical energy.

我们甚至没有,我们运用机械能,守恒定理时候

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• There must be something fundamentally wrong with the conservation of mechanical energy.

肯定什么基础性错误这个机械能守恒定理

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• So with this in mind, I feel comfortable to pursue my conservation of mechanical energy.

记住这个我们能够很放心,使用机械能守恒定理

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• We believe in the conservation of mechanical energy.

我们相信,机械能守恒定理

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• When you don't have to worry about criteria like that ordinary, mechanical energy rules supreme, and that's dictating where equilibrium lies.

如果担心这样要求,通常机械能就占据主要地位，并且决定平衡位于何处

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• This is visualizing the process of the conversion of mechanical energy into chemical and electrical energy very nicely.

一模拟恰到好处地演示了,机械能化学能电能转换过程

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• Kinetic energy can be converted back to potential energy, can be converted back, - but the sum of them — which we call "mechanical energy" — is conserved.

动能可以转化成为势能，也可以转化动能但是总和-我们叫做机械能恒定

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• So this is the conservation of mechanical energy.

因此机械能守恒

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• I believed in the conservation of mechanical energy and I overlooked the tension.

相信机械能守恒定理忽略张力

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• You see it on the general exams for physics, and it's simply a matter of conservation of mechanical energy.

一般物理考试中见到只是一个机械能问题

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• The second is more like a kite, transmitting mechanical energy to the ground, where generators turn it into electricity.

第二一个风筝机械能传递地面然后用发电机转化成电能

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• And therefore almost every mountaineer has with him or her a device which converts mechanical energy into electricity.

因此几乎所有登山者，都会携带一种机械能转化装置

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• Okay, I start off, point A is at a distance h h above this level, and so I apply now the conservation of mechanical energy.

好的开始了，A距离这个平面,高度现在运用,机械能守恒定理

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• Now I want to return to the conservation of mechanical energy.

现在回到机械能守恒

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• Now, I am such a strong believer of the conservation of mechanical energy that I am willing to put my life on the line.

现在很相信机械能守恒愿意生命，放到条线上

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• James Joules The physicist James Joules, after we we call after him the unit of work was the first to demonstrate that heat energy and mechanical energy are really equivalent.

物理学家我们命名单位,第一演示出,热能机械能相等人。

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• There is mechanical energy, MGH comes out in the scoops, and what does he notice?

机械能来自勺子看到什么？

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• And mechanical energy is only conserved if the force is a conservative force.

机械能只有恒定时才恒定。

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• So, a small increase in wind speed can lead to a big increase in the amount of mechanical energy you can harvest.

所以风速微小增加导致获得机械能大幅增加

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• It follows immediately from the conservation of mechanical energy.

紧跟着机械能守恒定理而产生。

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• We have also the conservation of mechanical energy.

还是机械能守恒

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• We have already seen a demonstration in class whereby we converted mechanical energy when someone was rotating, into electric energy.

课堂上我们已经看到,怎样物体旋转,将机械能,转化成电能的，演示例子

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• I used first the conservation - of mechanical energythere was no friction — and then I showed you that it's completely consistent with the work-energy theorem, so what would you do now?

首先机械能守恒定律-这里没有摩擦力-，我会你们展示功能定理完全一致，现在怎么做呢？

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• Mechanical energy is conserved, because gravity is a conservative force.

机械能守恒的，因为重力守恒

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• So they convert mechanical energy of rotation to magnetic energy, 1 which is not part of 801 so I will not go into how they do that.

它们旋转机械能转化磁能不是801部分1所以不会怎么

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• In the internal-combustion engine of a car, an electric spark explodes gasses in the cylinder; the heat energy moves the pistons, becoming mechanical energy to move the car.

汽车内燃机引擎里，电火花引爆气缸燃料气体，然后热能推动活塞成为机械能推动汽车行驶。

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• Let's try the conservation of mechanical energy.

我们机械能守恒定律解答一下。

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• We only used the concept of mechanical energy, which is conserved.

仅仅利用机械能概念守恒

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• Then we have the conservation - of mechanical energy — the sum of kinetic energy and potential energy.

我们知道机械能守恒定律-动能势能总和

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