Woman has a near point of 75.0 cm. What focal length, f, is necessary for the corrective lens so that he can hold his physics book 20.0 cm from his eye and read the pearls of wisdom contained therein clearly?

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.