Two plastic Iphone cases are charged separately by rubbing them with fur so they both lose electrons. Which of the following statements are true when the cases are then held close together( not touching). A-the cases will have no effect on each other
B-The cases will attract each other
C-The cases will become neutralized
D-the cases will repel each other

28. a stone is projected at a cliff of height h with an initial speed of 42.0 mls directed at angle θ0 = 60.0° above the horizontal. the stone strikes at a, 5.50 s after launching. find (a) the height h of the cliff, (b) the speed of the stone just before impact at a, and (c) the maximum height h reached above the grou

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?

Aphysical change is a change in the size, shape,, or stafe of matter true or false