來玩個有趣的題目吧

[sp012767 (還沒想到...)]

題目如下:
Consider a baseall bat to be a uniform rod of L .
And the center of mass is L/4 of the center of length.
show that the distance d form the center at which the bat
should strike a ball to minimum the impact on the hands ?
This point is called center of percussion or "sweep spot"
Assume that the motion of the ball is perpendicular to the bat.
翻譯:
有一支均勻球棒長L,質心位於棒子中心上方L/4處
計算-當球擊中棒子中心上方d處時,最不震手,求d的值為何?
這個點稱作"甜點"
假設球與棒子揮擊為垂直,且棒子厚度不計

噗 普物真是太有趣.......

無聊來點小遊戲吧 記得用甜點去打唷!!
http://www.tanrei.com/game/stadium/tanreistadium.swf

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推 abcdef:同學要接受啊XD
推 QQmickey:那棒子要從那開始看?
推 sp012767:樓上在說啥?
推 QQmickey:d= L/6 時手不震~來個正點的idea
推 sp012767:樓上抄答齁~題目我改過了啦 噗噗 想偷雞....
→ sp012767:      案