1. The problem statement, all variables and given/known data I need help with this problem, dont really know how to get started. In 1 hour, about how many argon atoms do you inhale that Julius Caesar also inhaled. Assume Julius lived 50 years and 1 liter of air holds about 6x10^20 atoms of argon. Also, assume the atmosphere is 200km thick. Also, it gives a hint to use the volume of a sphere: 4*pie*R^3/3. 2. Relevant equations I assume this involves circular motion somehow. And we have a time, so maybe the equation a = 4(pie)^2*R/T^2 can be of use. Also, I need to involve the volume of a sphere somehow. 3. The attempt at a solution Dont really know how to get started thats all I really want help with. Maybe a = 4(pie)^2*radius of the earth/50^2. To get started, dont really know what to do.