VectorsVectors (id: 0c8ec1622)

本题目来源于试卷: VectorsVectors，类别为 IB数学

[填空题]
Let $\mathbf{u}=\left(\begin{array}{c}1\\ 3\\ -2\end{array}\right)$ and $\mathbf{v}=\left(\begin{array}{c}k\\ 2\\ -4\end{array}\right)$ where k>0 . The angle between$\mathbf{u}$ and $\mathbf{v}$ is $\frac{\pi }{4}$ . Find the value of k .≈   

参考答案: 6.18±2%


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