作者marcoii (天边一朵云)
看板Physics
标题[问题] Marion Ch04-07
时间Tue Feb 24 20:16:23 2009
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对时间微分两次 (加速度)
1. 其中 L 为单摆长度
2. x_0没说是什麽常数
3. x的原点应该是预设在最低点的地方(中间)
请各位帮帮我解一下这个题目 我怎麽凑就是凑不出来
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1F:推 rogerfd:哇好强耶,这章我直接跳过 02/24 23:17
2F:推 microball:应该就是泰勒多展开一项吧...这应该也不是解析解 02/27 12:43
3F:→ marcoii:我有试过 可是结果会有根号存在,无法消去~ 02/28 23:44