1. Joni Johannson has a mass of 50 kilograms. She climbed 5 meters up the stairs to fetch a pail of water. How much work against gravity did she do?
Work - Mass x Acceleration due to gravity x height.

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.