The uppermost part of the mantle is part of earths?

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

In what direction does the medium move relative to the direction of the wave? explain.

Jessie ran 5000 meters from the cops and an average speed of 6 meters / second before he got caught . how long did he run?