When conducting an experiment, which of the following is generally true?

a. it is unsafe to preform a large number of experimental trials.
b. the number of trials preformed does not affect the validity of the results.
c. performing a smaller number of experimental trials makes the results more dependable.
d. performing a larger number of experimental trials makes the results more dependable.

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=

How do you know how many valence electrons an atom has?