A brass ring of diameter 10.00cm at 20C is heated and slipped over an aluminum rod diameter 10.01cm at 20C. Assuming the average coefficients of linear expansion are constant, to what temperature must the combination be cooled to separate them? what i was thinking of doing here is setting up two equations for the lengths as functions of temperature and equating them. i dont know what the equations are though that i am supposed to use here. thanks for the help.