First slide

Vectors

Question

Length of $2 \hat{i} + 3 \hat{j} + 4 \hat{k}$ in the xy plane is

Moderate

A

$\sqrt{13}$
B

$\sqrt{20}$
C

5
D

Zero

Solution

Length in XY plane is $\sqrt{{(2)}^{2} + {(3)}^{2}} = \sqrt{13}$

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