Which of the following is an example of potential energy: (choose 2)

- a fire
- a book standing still on a shelf in the library
- a printer that is not connected
- your cellphone, when you make a call to someone

Aman does 500 j of work pushing a car a distance of 2 m. how much force does he apply? assume there is no friction. a. 250 n b. 1000 n c. 125 n d. 500 n

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

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.