一個(gè)向量,方向是沿x軸,這個(gè)向量與另一個(gè)長(zhǎng)度為7.4m的向量相加,得到第三個(gè)向量,第三個(gè)向量是沿y軸,且長(zhǎng)度為第一個(gè)向量的4.3倍,求第一個(gè)向量的長(zhǎng)度.
設(shè)所求向量長(zhǎng)度為x,則第三個(gè)向量長(zhǎng)度為4.3x,由勾股定理得
x^2+(4.3 x)^2=7.4 ^2
解得x=1.676m
Vector ,which is directed along an x axis,is to be added to vector ,which has a magnitude of 7.4 m.The sum is a third ve
Vector ,which is directed along an x axis,is to be added to vector ,which has a magnitude of 7.4 m.The sum is a third vector that is directed along the y axis,with a magnitude that is 4.3 times that of .What is the magnitude of
幫個(gè)忙~..如果解不出給個(gè)翻譯也好
幫個(gè)忙~..如果解不出給個(gè)翻譯也好
數(shù)學(xué)人氣：737 ℃時(shí)間：2020-06-02 00:57:38
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