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3-1.Vectors
easy
सदिश $\left( {\hat i\,\, + \;\,\hat j} \right)$द्वारा $x-$ अक्ष तथा $y-$ अक्ष के साथ बनाया गया कोण ....... $^o$ होगा
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