The amount of energy for a coulomb of charge at one end of a conductor is 20 joules. The amount of energy for a coulomb of charge at the other end of the conductor is 20 joules. The potential difference across the ends of the conductor is . A.) 40 joules per coulomb
B.) 40 joules
C.) 40 coulombs
D.) 0 coulombs
E.) 0 joules per coulombs

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.