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[書籍] 閃電版普通物理作者 Robert Resnick 逝世

[ Physics ]26 留言, 推噓總分: +26

作者: costello - 發表於 2014/02/01 06:16(12年前)

10^F推NewPoliceman:RIP02/01 19:51

[問題] 平面拋射

[ Physics ]45 留言, 推噓總分: +14

作者: destinycode - 發表於 2014/01/30 02:50(12年前)

9^F推NewPoliceman:有答案嗎？θ=cos^-1(Hg/v^2+0.5)^0.5？02/01 13:57

12^F推NewPoliceman:phys.cersp.com/KSPJ/sGz/XTTT/200710/4247.html02/01 20:30

13^F→NewPoliceman:裡面有4種解法。第四種明瞭多了，計算不複雜02/01 20:32

18^F→NewPoliceman:剛開網頁正常耶02/02 17:16

22^F推NewPoliceman:將x,y軸的位移投影至水平方向得 [V0(V0-Vx)]/gtanθ02/03 20:34

23^F→NewPoliceman:Vx=0 有最大值02/03 20:34

27^F推NewPoliceman:不可能是負的 x軸的方向就是初速度的方向02/04 13:20

29^F推NewPoliceman:我了解你的意思了，Vx=0 已落地，V0≧Vx≧002/04 20:08

30^F推NewPoliceman:這解釋好像回到你原來的疑問XD…質點在x軸的運動就像02/04 20:26

31^F→NewPoliceman:垂直上拋一樣，x軸位移最大時剛好落地(即Vx=0時)02/04 20:35

35^F推NewPoliceman:舉個反例好了，Vx=-V0時水平位移更大，但垂直位移>H02/05 16:50

36^F→NewPoliceman:只要Vx開始變負的，垂直位移即開始>H02/05 16:58

37^F→NewPoliceman:且質點速度V會大於(V0^2+2gH)^0.5，不合理02/05 17:00

[請益] 有甚麼因素會影響水結晶形狀?

[ Physics ]34 留言, 推噓總分: +7

作者: NChewinggum - 發表於 2014/01/11 21:02(12年前)

1^F推NewPoliceman:物理冶金學可以解釋雪花的結晶形狀凝固需要一定的過01/11 23:40

2^F→NewPoliceman:冷度過冷度會影響該物質成核後的成長形狀可以由過01/11 23:46

3^F→NewPoliceman:冷度方面著手看看01/11 23:46

4^F→NewPoliceman:我推完才點連結SORRY...圖裡說明的就是過冷度對結晶01/11 23:47

5^F→NewPoliceman:的影響成核的地方也是關鍵例如在空氣中與在容杯中01/11 23:51

6^F→NewPoliceman:還有形狀會讓表面能較大的面面積小一點目前想到這01/11 23:53

7^F→NewPoliceman:幾點參考一下01/11 23:54

8^F推NewPoliceman:還有組成也會影響例如合金的熔點會隨組成改變所需01/11 23:58

9^F→NewPoliceman:過冷度也會變01/11 23:59

15^F推NewPoliceman:其實把橫軸的溫度扣掉0度C(熔點)即過冷度凝固可由01/13 01:40

16^F→NewPoliceman:成核與成長來解釋 accommodation factor大的地方成01/13 01:42

17^F→NewPoliceman:長速率較快會影響凝固後的形狀不是指晶體結構唷01/13 01:44

18^F→NewPoliceman:看那圖冰的結晶的確滿複雜的01/13 01:44

19^F推NewPoliceman:凝固來說 a-factor是指液相原子在固相界面找到一個01/13 13:31

20^F→NewPoliceman:穩定位置的機率例如fcc的(100)界面>(111)界面因為01/13 13:35

21^F→NewPoliceman:(100)較鬆散可由計算該界面的單位面積原子數來比較01/13 13:36

22^F→NewPoliceman:在固液界面有過冷(熱過冷、組成過冷) a-factor大處就01/13 13:39

23^F→NewPoliceman:會長得較快因為該處比較容易成長比較凸出過冷度比01/13 13:41

24^F→NewPoliceman:a-factor小的面大成長得就較快01/13 13:45

25^F推NewPoliceman:成核方面過冷度愈大臨界核半徑愈小能障也愈小愈01/13 13:49

26^F→NewPoliceman:易成核。過冷度大a-factor大的地方長很快易形成樹01/13 13:55

27^F→NewPoliceman:枝狀過冷度小a-factor大處沒長那麼快易形成條狀01/13 13:57

28^F推NewPoliceman:凝固的基礎理論可以搜尋金屬的凝固看看縱軸過飽和度01/13 14:02

29^F→NewPoliceman:我不太清楚簡單的想法是看成絕對溼度?也就是實驗是01/13 14:13

30^F→NewPoliceman:冷凍水蒸氣再拿去分析形狀?01/13 14:15

31^F推NewPoliceman:補充一下︰對水來說，a-factor較大處，過冷度較大01/13 14:45

32^F→NewPoliceman:是因為在固液界面有“溫度反轉”現象，凝固釋放潛熱01/13 14:46

33^F→NewPoliceman:使界面處溫度重新分佈，產生一個負的溫度梯度。較凸01/13 14:47

34^F→NewPoliceman:出之處的溫度更低，因此有較大的過冷度。字亂請見諒01/13 14:48

[問題] 都卜勒

[ Physics ]30 留言, 推噓總分: +8

作者: Jerryegg - 發表於 2014/01/10 18:49(12年前)

10^F推NewPoliceman:應該沒有吧?不然在車上聽收音機音樂都變調了01/11 00:18

[題目] 鉛直圓周運動有摩擦力的問題

[ Physics ]6 留言, 推噓總分: +2

作者: colorya2001 - 發表於 2010/03/10 19:52(16年前)

1^F推NewPoliceman:如果無摩擦在1/4圈時v=√(3gL)恰可做圓周運動03/10 21:43

2^F→NewPoliceman:所以有摩擦會使m在1/4圈時 v<√(3gL) 是降嗎?03/10 21:45

6^F推NewPoliceman:m與鉛直軸有角度後好像都不符合恰可圓周運動03/10 22:30

[題目] (行星運動)看似簡單的問題，但卻不知如 …

[ Physics ]3 留言, 推噓總分: +1

作者: alenbe - 發表於 2010/02/06 19:35(16年前)

1^F推NewPoliceman:力學能守恆?02/06 20:01

Re: [問題] 沿斜面滑下的問題

[ Physics ]4 留言, 推噓總分: +2

作者: pap641217 - 發表於 2010/01/13 19:28(16年前)

1^F推NewPoliceman:它們經過的時間一樣01/13 20:40

[問題] 一篇讓人感動的報告

[ Physics ]38 留言, 推噓總分: +20

作者: zivlin - 發表於 2010/01/12 23:27(16年前)

13^F推NewPoliceman:我想再修一次您的課01/12 23:47

[問題] 沿斜面滑下的問題

[ Physics ]15 留言, 推噓總分: +4

作者: pap641217 - 發表於 2010/01/12 15:18(16年前)

5^F推NewPoliceman:m的位移可拆成垂直位移ABsinθ01/13 13:50

6^F→NewPoliceman:水平位移M*ABcosθ/(M+m)。m的速度與與水平夾ψ01/13 13:54

7^F→NewPoliceman:tanψ=Vy/Vx=m的垂直位移量/m的水平位移量01/13 13:56

8^F→NewPoliceman:第二題能量守恆再代入第一題的結果就行了01/13 13:58

9^F推NewPoliceman:第一小題用相對速度好像快多了...01/13 15:30

[閒聊] 今天在系辦看到不知道誰寄來系上的書

[ Physics ]24 留言, 推噓總分: +9

作者: mouwat - 發表於 2009/12/26 00:28(16年前)

1^F推NewPoliceman:烤地瓜XD12/26 00:38

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