Two point charges of magnitude +2.0.x 10-7 coul and +8.5 X 10+ coul are 12.cm apart. (a) What electric field does each produce at the site of the other? (6) What force acts on each?

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.