Question

VETORES
Sendo |u|=3 , |v|=2 e 60° o ângulo formado entre u e v, Calcule |u+v|.

Answer 1

utilizando a regra do paralelogramo

$|U+V|^2=|U|^2+|V|^2+2*|U|*|V|*cos(\theta)\\\\|U+V|^2=3^2+2^2+2*3*2*cos(60)\\\\|U+V|^2=13+12* \frac{1}{2} \\\\|U+V|=\sqrt{19}$