Angle made by vector left( {hat{i},, + ,hat{j}} right) with x- axis and y axis is

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3-1.Vectors

easy

The angle made by the vector $\left( {\hat i\,\, + \;\,\hat j} \right)$ with $x-$ axis and $y$ axis is

A

$45^o, 60^o$

B

$60^o, 60^o$

C

$45^o, 45^o$

D

$60^o, 45^o$

Solution

$a = \sqrt {{a_x}^2\,\, + \;\,{a_y}^2} = \sqrt {{1^2} + \;\,{1^2}} = \sqrt 2$

$\cos \alpha = \frac{{{a_x}}}{a} = \frac{1}{{\sqrt 2 }}$

$\therefore \alpha = 45^\circ ;\,\cos \,\beta = \frac{{{a_y}}}{a} = \frac{1}{{\sqrt 2 }}$

$\therefore \beta = 45^\circ $

Standard 11

Physics

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