Apiece of cobalt has a mass of 41 g and is initially electrically neutral. it is then charged with q = +0.6 µc.
(a) how many electrons were removed from the piece of cobalt in the charging process (in electron)
(b) what fraction of the total number of electrons in the piece of cobalt does the number in part (a) represent?
(removed electrons/total electrons)

In 1995 a research group led by eric cornell and carl wiemann at the university of colorado successfully cooled rubidium atoms to the 20-200 nk temperature range. assuming (incorrectly) that the rubidium atoms behave liké particles of a classical ideal gas, calculate the rms speed of a rubidium atom at a temperature of 112.0 nk. in the experiments one particular isotope of rubidium was used, rubidium-87. the molar mass of this isotope is 86.91 q/mol. tries 0/20 submit answer

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

How can waves travel through ground?