把一石頭沿水平路面以2 m/s等速率拖動所需之功率為100Watt,問阻力大小為 何?
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把一石頭沿水平路面以2 m/s等速率拖動所需之功率為100Watt,問阻力大小為 何?
Posted in 功率.
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By admin – 2009 年 04 月 09 日
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