[問題] Marion Ch04-07
Consider the free motion of a plane pendulum whose amplitude is not small.
Show that the horizontal component of the motion may be represented
by the approximate expression (components through the 3rd order are included)
..
x + (g/L)[1 + (x_0 / L)^2 ] x - (3g/2L^3)x^3 = 0
..
0. x 是 x對時間微分兩次 (加速度)
1. 其中 L 為單擺長度
2. x_0沒說是什麼常數
3. x的原點應該是預設在最低點的地方(中間)
請各位幫幫我解一下這個題目 我怎麼湊就是湊不出來
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