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标题: 架桥 [打印本页]

作者: ob    时间: 2006-10-24 09:16
标题: 架桥

有4根长为1的木板(宽度、厚度不记),在一条河上架桥,河宽不能超过多少?

注意:木板是有重量的,情况理想化。

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作者: math59    时间: 2006-10-25 13:19
标题: 回复:架桥

考虑摩擦力,3.999米
否则1.5米 注此桥严禁任何质量>0 物体通过


 

作者: yinyin    时间: 2006-10-27 06:08
标题: 回复:回复:架桥

At most 12/7. It is larger than 1.5 given by math 59.
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作者: yinyin    时间: 2006-10-29 05:25
标题: 回复:回复:架桥

If the wooden board and the river bank are hard enough, theoretically, the length of the bridge (similar to a Chinese stone arch bridge) may be any positive number less than 4 such as 3.999 that math59 mentioned.

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