A 14-gram ovarian tumor is treated using a sodium phosphate solution in which
the phosphorus atoms are the radioactive Phosphorus-32 isotope with a half-life
of 14. 3 days and which decays via beta emission (RBE=1) with an energy of 1.71

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.