The diagram below represents a light ray striking the boundary between air and glass. What would be the angle between this light ray and its reflected ray? 30°

60°

120°

150°

Which property of fossils allow scientists to determine the relative rock ages..

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.

In a good thermo flask the main cause of heat loss is