If the density of an object is 60 g/cm^3 and its mass is 20 grams, what is its volume in cm^3?
a) 0.33
b) 3
c) 80
d) 1200

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.

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?