Question

Please help me guys please solve

Answer 1

howdy !!

your answer is

Given, vector A = 0.4i + 0.3j + ck

and vector A is unit vector
so, its magnitude is one .

also, magnitude of vector A
=
$\sqrt{ {(0.4)}^{2} + {(.03)}^{2} + {(c)}^{2} }$

therefore ,

$\sqrt{ {(0.4)}^{2} + {(0.3)}^{2} + {(c)}^{2} } = 1 \\ \\ = > 0.16 + 0.09 + {c}^{2} = 1 \\ = > 0.25 + {c }^{2} = 1 \\ = > c = \sqrt{0.75}$

or , √75/100 = 5√3/10=0.5√3

hope it help you