The vector component of $\vec{a} = 2\hat{i} + 3\hat{j}$ along the direction of vector $\vec{b} = (\hat{i} + \hat{j})$ is:

  • A
    $\hat{i} + \hat{j}$
  • B
    $\frac{1}{2}(\hat{i} + \hat{j})$
  • C
    $\frac{5}{2}(\hat{i} + \hat{j})$
  • D
    $\frac{5}{\sqrt{2}}(\hat{i} - \hat{j})$

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For what value of $x$ will the two vectors $\vec{A} = 2\hat{i} + 2\hat{j} - x\hat{k}$ and $\vec{B} = 2\hat{i} - \hat{j} - 3\hat{k}$ be perpendicular to each other?

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