Three different pith balls (P, Q, and R) are charged by contact. Then the pith balls are brought close to each other. Pith balls P and Q attract each
other. Pith balls P and Rrepel each other. Which of these could be the
charges on the three pith balls?

a) OP:-Q: +R: +
b) P: - O: +R: -
c) P: - Q:-R: +
d) P: - Q:-R: -
e) O
P: +Q:-R: -

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?