If the force on a spring is 2 N and it stretched 0.5 m, what is the spring constant? O A. 2 N/m
OB. 0.2 N/m
OC. 0.4 N/m
OD. 4 N/m

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical