Question

Dados a= 12u e b=8u, calcule o módulo do vetor R= a + b. O ângulo entre a e b mede 120º.

Answer 1

$<var>\sqrt{12^{2}+8^{2}+2(12\cdot8)\cdot}cos120=</var></p> <p><var> \sqrt{144+64+2\cdot96\cdot cos120=</var></p> <p><var> \sqrt{208+192\cdot cos 120}=</var></p> <p><var> \sqrt{208+192\cdot -1/2}=</var></p> <p><var> \sqrt{208-(192\cdot 1/2)]=</var></p> <p><var> \sqrt{208-96}=</var></p> <p><var> \sqrt{112}</var>$