Question

0.4i+0.8j^+ck^ represents a unit vector when c is

Answer 1

Explanation:

$0.4 {}^{2} + 0.8 {}^{2} + c {}^{2} = 1$

$0.16 + 0.64 + c {}^{2} = 1$

$c {}^{2} = 1 - 0.8$

$c {}^{2} = 0.2$

$c = \sqrt{0.2}$