An archer pulls his bow back and holds it still in position before it is released. What
type of energy is in the stretched bow prior to being released?

gravitational potential energy
elastic kinetic energy
elastic potential energy
gravitational kinetic energy

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

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.