重力势能

，重力势能，不管R是多少，距离这个物体多远。

Gravitational potential energy at any distance capital R that you please away from this object .

形式定义就是，它在点P的重力势能，等于我，将物体从无穷远处，移动至点P所做的功。

The formal definition is that the gravitational potential energy at a point P is the work that I , Walter Lewin , have to do to bring that mass from infinity to that point P.

接近地球，，If，I，go，from，A，to，another，point，，B，prime，注意，重力势能，就会减小，我做负功。

B1 which is closer to the Earth , notice that the gravitational potential energy decreases .

将来会有很多次，用到r和，重力势能之间的关系。

We will , many , many times in the future , use the one over r relationship for gravitational potential energy .

？，So，now，what，is，h2？，Well，根据机械能守恒，我们知道，我们把点A的，重力势能，称之为。

H2 = we could now use the conservation of mechanical energy , and we could say , let us call arbitrarily the gravitational potential energy at point A , 0 let 's call that zero .

我们把mgy叫做。，给它一个名字，重力势能

We call mgy * we give that a name ," gravitational potential energy . "

你们看，是重力势能。

Mhy You see ? mgy is gravitational potential energy .

重力势能驱动旋流反应器及其冶金特性的实验研究

Experimental study on metallurgical characteristics of swirling reactor driven by gravitational potential energy

我先给你一个对于，重力势能的形式定义。

Let me first give you the formal definition of gravitational potential energy .

重力势能，朝这个方向增长，重力。

When I 'm here , the gravitational potential energy increases in this direction .

注意，这里，重力势能是增加的。

Notice that the gravitational potential energy increases .

这是。，那么这里的重力势能，这是。

Y And this is y * Then the gravitational potential energy u This is u.

这是重力势能。

This is the gravitational potential energy .

所以你在利用，重力势能，转换成，动能。

So you 're using , then , the conversion of gravitational potential energy to kinetic energy .

因此，该物块的重力势能的减少，等于该弹簧的弹性势能的增加。

Hence , the loss of gravitational potential energy of the block equals the gain of elastic potential energy of the spring .

重力势能，这样增长，重力；，是在这个方向，当我在这里。

When I 'm here , gravitational potential energy ; increases in this way ; the gravitational force is in this direction .

因此这是关于y的关系，曲线本身，很有效地代表了，重力势能。

So this is a function y as a function of x and the curve itself represents effectively the gravitational potential energy .

石漠化形成的主要原动力是自然生态系统的雨水动能和重力势能，亦是其形成的直接动力或第一性动力。

Rain energy and gravitational potential energy were original energies of rocky desertification form in nature ecosystem , and were direct or primary motivity .

因此如果我画一张，重力势能，受y变化的图，那么会得到一条直线。

So if I make a plot of the gravitational potential energy as a function of y , then I would get a straight line .

利用液压泵/马达的四象限工作特性，能够有效地实现制动动能和重力势能的回收与再利用。

Hydraulic pump / motor has the characteristic of four quadrant work , which can regenerate and reuse the inertial and gravitational energy of load .

被动步行机器人是一种仅依靠自身机械结构并利用重力势能沿斜坡步行的机器人。

A passive walker is a kind of walking robot , which can walk down a slope by its mechanical structure and gravitational potential energy .

那么它将是，正的重力势能，这样的话这点，就比另一点高。

Then this will have a positive gravitational potential energy , and this will have one that is higher than this one by this amount .

这就是重力势能，转换到，动能，再回到，重力势能，最终停在这里。

There is a conversion from gravitational potential energy to kinetic energy back to gravitational potential energy , and it will come to a stop here .

现在要做的，就是要转化，所有这些重力势能，变成圆盘的动能。

Now , what we would like to do is we would like to convert all this gravitational potential energy into kinetic energy of that disk .

我手里物体的重量，注意，重力势能，增加了，我必须做正功。

M If I move from point A to point B , with a mass m in my hand , notice that the gravitational potential energy increases .

可以在车内装个圆盘，可以称之为飞轮，可以转化，重力势能。

You can install a disk in your car , which I would call , then , a flywheel , And you can convert the gravitational potential energy .

不管你是乘电梯，去大厦的顶层，或者是步行，重力势能的变化是相同的。

Whether you take the elevator to the top of the Hancock Tower or whether you walk up the stairs , the change in gravitational potential is identical .

二次调节传动技术不但具有系统效率高、可控性好的优点，而且可以实现对负载制动动能和重力势能的回收和再利用，达到节能的目的。

Secondary regulation system has many advantages , such as high efficiency , good controllability and recycling and reusing the braking dynamic energy and geopotential energy of the load .

当地球内部在重力势能和放射能的作用下继续熔融时，地球表面固化为原始岩石圈。

With effect of geopotential and radiation energy , when the interior of the earth continued to melt , the surface of the earth solidified to form the original lithosphere .

因为只要物质，在视界外部，旋转，它还是会变得很热，因为重力势能。

And the answer is yes , we can , because as long as the matter that swirls in is outside the event horizon , it would still be very hot .