Question

Considere 2 → u = 3(cos30°, sen 30°). O módulo do vetor → u é: (Ref.: 202115185062) 3 √ 2 2 3 2 2 3 3 2

Answer 1

Resposta:

$\frac{3}{2}$

Explicação passo a passo:

2u=3(cos30°,sen30°)

2u=3($\frac{\sqrt{3} }{2}$,$\frac{1}{2}$)

2u=($\frac{3\sqrt{3} }{2}$,$\frac{3}{2}$)

2 $u^{2}$= $(\frac{3\sqrt{3} }{2} )^{2}$+ $(\frac{3}{2} )^{2}$⇒ $\frac{9.3}{4}$ + $\frac{9}{4}$

2 $u^{2}$= $\frac{27+9}{4}$ ⇒$\frac{36}{4}$⇒ 9

2 $u^{2}$= 9

2 u= $\sqrt{9}$

2 u= 3

Módulo de ΙuΙ = $\frac{3}{2}$