Levi and clara are trying to move a very heavy box. levi is pushing the box with a force of 30 n, and clara is pulling the box with a force of 50 n. the box exerts a frictional force of 65 n. which best explains the forces? answer there is a net force of 15 n allowing levi and clara to move the box.

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.