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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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