4. An ion of iron has an 26 protons, 30 neutrons, and 23 electrons. What are its atomic number, atornic mass, and net charge? A. atomic number = 26, atomic mass = 56, net charge = 3+
B. atomic number = 26, atomic mass = 56, net charge = 3-
C. atomic number = 30, atomic mass = 56, net charge = 3+
D. atomic number = 56, atomic mass = 26, net charge = 3-

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

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.