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範例 40：鐵鏈從桌上滑下 |
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如下圖，有一質量均勻的鐵鏈，四呎長，一呎下懸桌面，往下滑，在無摩擦力之下，需花費多少時間，才完全離開桌面？
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《 解答 》 |
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設密度為 ，滑速為 ，動能為  ，動能源自下垂部分之位能差，位能可以質心計算，位能＝ ，當  時，位能=  。
方程式為  ，
 ， ，
所以 ，當  時， 。
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About
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This document
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