Question

If a unit vector is represented by $0.5\hat{i}-0.8\hat{j}+c\hat{k}$ then the value of c is

Answer 1

Magnitude of unit vector is unity i.e. $|\hat{A}|=1$

Or $\sqrt{{0.5}^2+{0.8}^2+c^2}=1$

Or $0.25+0.64+c^2=1$

$⟹c=\sqrt{0.11}$