We have two thin concentric conducting spherical shells. There is a charge Q on the inner shell (with radius a) and a charge -Q on the outer shell (with radius b). Find Va-Vb, the difference in potential on the surfaces of the two spheres.

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

J. j. thomson’s experiment disproved the theory that an atom

When solid surfaces slide over each other the kind of friction that occurs is called friction