A) \[7\,(\mathbf{i}+\mathbf{j}+\mathbf{k})\]
B) \[\frac{7}{3}\,(\mathbf{i}+2\mathbf{j}+2\mathbf{k})\]
C) \[\frac{7}{9}\,(\mathbf{i}+2\mathbf{j}+2\,\mathbf{k})\]
D) None of these
Correct Answer: B
Solution :
\[|\mathbf{b}|\mathbf{\hat{a}}=\sqrt{9+36+4}\left( \frac{\mathbf{i}+2\mathbf{j}+2\mathbf{k}}{\sqrt{1+4+4}} \right)=\frac{7}{3}(\mathbf{i}+2\mathbf{j}+2\mathbf{k}).\]You need to login to perform this action.
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