Calculate the net torque (magnitude and direction) on the beam in the figure about
an axis through O perpendicular to the
page.
25 N
30%
O
< 20°
45°
C С
2.0 m
10 N
4.0 m
30 N​

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.