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[好奇] 機車的流體力學?消失

[ Physics ]9 留言, 推噓總分: +6

作者: trbtrb - 發表於 2009/04/20 12:01(17年前)

8^F推linesa:速克達差不多就8,90km/hr 要飛起來還真不容易...04/20 21:27

Re: [問題] 牛頓第三定律

[ Physics ]19 留言, 推噓總分: +8

作者: Beachboy - 發表於 2009/01/17 22:18(17年前)

2^F推linesa:作用力反作用力不能相加阿~ 所以不可以甲不可以8+501/17 22:57

3^F→linesa:應該要先把總合力算出來 8-5=3 兩者各受3N01/17 22:57

[題目] 反射波

[ Physics ]4 留言, 推噓總分: +1

作者: colorya2001 - 發表於 2009/01/02 16:38(17年前)

1^F推linesa:在d全反射(無透射波),Asin(kd-wt)+Asin(kd+wt+Φ)=0,I+R=T01/02 19:52

2^F→linesa:sin(kd-wt)=-sin(kd+wt+Φ) = sin(-kd-wt-Φ)01/02 19:53

3^F→linesa:Φ=-2kd01/02 19:54

[請益] 請問何謂ergodic hypothesis？

[ Physics ]15 留言, 推噓總分: +4

作者: waytin - 發表於 2009/01/02 12:19(17年前)

2^F推linesa:各態歷經~ 我上過一堂渾沌理論的課,老師的解釋是: 一個孤立01/02 14:34

3^F→linesa:系統,系統從任意的初始狀態開始,只要經歷的時間夠長,則系統01/02 14:34

4^F→linesa:會經歷過所有的,可能的微觀狀態 =_=|||01/02 14:35

5^F推linesa:更簡單的說,是我們平常所觀察到系統的宏觀性質,是系統內01/02 14:37

6^F→linesa:微觀的變量,在相對長時間所平均的結果...Orz01/02 14:38

[問題] 庫倫引力

[ Physics ]6 留言, 推噓總分: +2

作者: lalakaka0924 - 發表於 2009/01/02 04:42(17年前)

1^F推linesa:帶電物體靠近不帶電物體後,會極化不帶電物體,所以引力還是01/02 06:41

2^F→linesa:存在01/02 06:41

4^F推linesa:恩,要先算出極化電荷在物體內的分布,然後對所有電荷積分01/02 07:23

5^F→linesa:但基本公式還是庫倫定律01/02 07:23

[請益] "變形磚"原理？

[ Physics ]6 留言, 推噓總分: +5

作者: alenbe - 發表於 2008/12/16 21:27(17年前)

4^F推linesa:這就是剪變厚流體阿~ 剪應力越大,黏滯係數越大12/17 16:34

[請益] 光學

[ Physics ]3 留言, 推噓總分: +1

作者: iNicholas - 發表於 2008/06/02 00:36(17年前)

1^F推linesa:波遇到狹縫會產生新子波進行繞射雙狹縫會形成兩個06/02 02:47

2^F→linesa:兩個子波距離很近因而互相干涉然後就可以看到明暗處啦~06/02 02:48

Re: 請問為何光速恆定?

[ Physics ]3 留言, 推噓總分: +1

作者: caseypie - 發表於 2008/04/25 11:26(18年前)

1^F推linesa:+1 知道是這樣...但是不知道位什麼是這樣 XDD04/25 14:04

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