A car weighing 9544 N is parked on a 24.3 degrees hill. How much of the force of gravity is acting parallel to the hill and how much of the force of gravity is acting perpendicular to the hill?

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.

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Why do astronauts in the space shuttle weigh less?