How fast does a 0.04 kg arrow need to travel to have 50 Joules of kinetic energy?

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

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.

Does anyone have the answers to online physics course plato course physics, semester a v3.0