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ch7 070201(12:28)
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力學
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郭俊偉
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May 25, 2013, 11:07:49 PM
5/25/13
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Ek=0.5mv^2,1.老師說v是向量,但是它上面沒箭頭,應該是"速度的大小"吧!? 2.若v向量,那為何"向量平方"是純量(向量有三積:平方應該指內積吧)?
註:(a向量)的平方 = (a向量)內積(a向量)
= (a向量大小)(a向量大小)cos(0度)
= (a向量大小)的平方
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May 28, 2013, 8:30:39 AM
5/28/13
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嗯?向量的內積就是純量阿(
參考維基百科
)
您在備註中也提到
(a向量)的平方 = (a向量)內積(a向量)
郭俊偉於 2013年5月26日星期日UTC+8上午11時07分49秒寫道:
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