How much would a pair of 0.5 kg shoes weigh on Earth? (Include units in
your answer) *

How do you know how many valence electrons an atom has?

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.

What happens when the number of protons in an atom changes