The scattering of a stream of positively charged particles when striking a thin film of gold confirms that A the positive charge in an atom must be located in a dense central mass. B atoms contain electrons in varying energy layers around the nucleus. C electrons are found in the center of an atom. D electrons can only be found within predicted areas surrounding the nucleus.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

What is the magnitude of the gravitational force acting on the earth due to the sun?