乜野係unit vector？
回答 (1)
2006-12-13 9:57 pm
✔ 最佳答案
Unit vector is a vector whose magnitude is 1.E.g. i , j , k
A vector b=xi+yj+zk
|b|=(x^2 + y^2 + z^2) sqrt.
The unit vector of b is that, the direction of b has not changed, but the magnitude.
^
b=(x^2+y^2+z^2)sqrt./|b|
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https://hk.answers.yahoo.com/question/index?qid=20061212000051KK05072