A rock which has a mass of 25 kg is on a cliff 42 m high. Calculate the rock's
Potential Energy.

True or false graphs must include scales that increase by the same amount

(a) calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) imagine adding electrons to the pin until the negative charge has the very large value 1.00 mc. how many electrons are added for every 109 electrons already present

Most of the volume of an atom is occupied by the