Sobre um bloco atuam duas forças de módulo 150n como mostra a figura a seguir. sendo o cos50º= 0,64 e o sen50º= 0,76 o módulo da força resultante é aproximadamente: A- 82,6
B- 114,0
C- 96,0
D- 102,5
E- 150,0

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.