作者查詢 / mike7689
作者 mike7689 在 PTT [ Grad-ProbAsk ] 看板的留言(推文), 共162則
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3F→:推一下Riccati...不過要先找特解...@@11/16 11:23
1F推:人+旋轉椅系統,整個系統有初角速度Wo,有初始角動量Io;現10/30 18:48
2F→:更正:是初始角動量Lo...10/30 18:48
3F→:現在把人"去掉",剩下轉椅,轉動慣量一定比初始系統還小,10/30 18:49
4F→:但整個系統在過程中根本沒受到外力矩作用,所以角動量守恆10/30 18:50
5F→:為了維持恆定的角動量,"單獨轉椅"轉速一定會變快...10/30 18:51
7F推:"人+轉盤"一開始就是一個系統,人不管怎麼跳,對轉盤來說都10/31 12:13
8F→:是"內力",對系統來說內力&內力矩完全不會造成線動量&角10/31 12:16
9F→:動量的影響...10/31 12:17
10F→:想一個簡單的例子你就明白:整個"人體"是一個系統,你可以10/31 12:17
11F→:用你的手抓住自己頭髮或是抱住自己大腿,把自己騰空提起?10/31 12:18
12F→:這是不可能的~!這就是"內力"的概念...10/31 12:19
4F→:回去把向量分析基礎唸完= =10/29 23:40
2F噓:國文先學好再來...10/24 22:03
3F→:算了~直接說~關鍵字:"尤拉公式"10/24 22:05
5F→:對啊~就是尤拉公式XD10/24 22:07
12F噓:補噓...10/29 14:12
1F推:-sin(theta2 - theta1) * (-1)10/18 23:12
2F推:這話題真的爛掉了...10/15 00:54
6F→:哎呀~眼殘XD 分母有X的話...似乎不是初等函數可以表示...10/15 13:02
2F→:基本上若不是物理的...Bessel和Legendre看看就好XD09/21 23:24
4F→:就是討論區...09/19 15:31
1F推:提示:國中的餘弦定理...09/18 17:44
5F→:115也是用這本~這本要搭配補充教材比較好@@09/16 13:22
6F→:學長推薦了另外一本Griffiths(貓書),不過沒時間翻>"<09/16 13:23