thought experiment

salmonfish · 发表于 2007-10-9 23:08:32

一个带静电的纯金属实心球，其过量电荷将均匀分布于该球表面上（中学物理）。那么，试想如果纯金属实心球只带一个多余的电子，即只带一个负电荷，此单电子将怎么分布于该球中？请给出解释和原理。

本贴由[salmonfish]最后编辑于：2007-10-9 15:35:35

salmonfish · 发表于 2007-10-12 23:26:59

如果这一单电子并不改变金属中大量自由电子的分布状态的话，且“金属中是大量的. 总体电子分布还是各向均匀地向球的表面略微移动”，那么，金属球中心和其表面的电位势就会不同。这样，在金属球上连出两导线，一根从中心（+ve)，一根从表面(-ve), 就会构成一个电池。

这似乎是不可能的。

idiot94 · 发表于 2007-10-12 01:25:54

problem below... you do not sound like a truck driver, but more like a truck engineer ... I do not know any real pro drivers, so I am certainly guessing... but my feeling is that you know way too much :D ....

idiot94 · 发表于 2007-10-12 01:18:35

"when driving, your eyes are on the road, your butt is on the seat, but your mind can go anywhere you want (to the black hole, to the infinite small of Xeno's paradox, to the single charge on a metal ball,....you name it)"

But I am no pro driver, so I have no idea. I just feel like ... well, maybe I was just sterotyping... :)

xyh · 发表于 2007-10-12 00:20:52

看到诱人的薪水，比在餐馆打工强很多。也有点蠢蠢欲动。不过后来因为没有驾照，也没有工作许可，所以放弃了。

我想，对于喜欢开车的人来说，这的确十分不错的差事。唯一的缺点在我看来就是生活没有规律，每天24小时轮班开车。

开开心心 · 发表于 2007-10-11 23:54:04

1. good pay.

要长时间工作換回来

2. free travelling

工作那算是travelling

3. freedom when you are on a trip

有工作在身，freedom？

4. no physical labour

18 wheeler 是 physical job，全球人都知道

5. no mentle worry

真的从未遇过大塞车吗？

6. play free, real road racing games with those real drivers in the real luxury cars. (not video games)
看人玩不如自己玩，驾luxury cars才爽呢！

7. make lots of friends without personal obligation to them.

或许连姓什名谁也搞不清楚。friends？牽强一点吧！

8. eating well, drinking well, sleeping well.

饮、食、休息无定时，好好就更谈不上。

salmonfish · 发表于 2007-10-11 23:16:50

18 wheeler is a very good job.

1. good pay.
2. free travelling
3. freedom when you are on a trip.
4. no physical labour.
5. no mentle worry.
6. play free, real road racing games with those real drivers in the real luxury cars. (not video games)
7. make lots of friends without personal obligation to them.
8. eating well, drinking well, sleeping well.
etc., etc.....
but most important point is:
when driving, your eyes are on the road, your butt is on the seat, but your mind can go anywhere you want (to the black hole, to the infinite small of Xeno's paradox, to the single charge on a metal ball,....you name it)

Is your job better than this?

只看该作者 · 发表于 2007-10-11 01:37:36

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idiot94 · 发表于 2007-10-10 21:27:19

您会是个卡车司机？不可能。。。真的不可能！

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thought experiment

回复：我来蒙一下.

again, after reading your reply to the mileage

[:-K]isn't that a bit dangerous ?: )

说到18轮，我也曾经想干过

还未看到一点好处[:-K]经你一说，更绝对相信你不是18 wheeler[:-T]

why not?

打死我也不信。。