摩擦力.圓周運動.真空 - 運動
By Noah
at 2011-05-07T00:00
at 2011-05-07T00:00
Table of Contents
如果一個中空圓形管內.沒有摩擦力.也是真空(宇宙)如果裡面有東西在運動而東西會停下嗎?(圓周運動)或者他會因為什麼停下來!而真空圓形管沒摩擦力做得出來嗎?...Showmore
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運動
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