Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 680 km above the surface of the Moon, where the acceleration due to gravity is 0.867 m/s2. The radius of the Moon is 1.70 x10^6 m.(a) Determine the astronaut's orbital speed.(b) Determine the period of the orbit.

What are igneous intrusions and extrusions

Which subatomic particle has a negative charge

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.