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标题: 辨别球的材料 [打印本页]

作者: ob 时间: 2005-2-1 23:09
标题: 辨别球的材料

两个空心球，大小及重量相同，但材料不同。一个是金，一个是铅。空心球表面图有相同颜色的油漆。现在要求在不破坏表面油漆的条件下用简易方法指出哪个是金的，哪个是铅的。

作者: QL 时间: 2005-2-2 06:04
标题: 回复：辨别球的材料

Spin the two balls, the one that rotates for the longer time is made of gold.

作者: 新用户 时间: 2005-2-2 08:05
标题: 回复：回复：辨别球的材料

Great! It reminds me of eggs. I remember I used this way to determine the cooked eggs.

作者: ob 时间: 2005-2-4 00:26
标题: Smart!

Other way is to put buth balls on a slope and see which one get to the bottom first. The golden ball arrives to the bottom first. But the slope should be long enough to show the difference.

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