A brass ring of diameter 10.00 cm at 20.0°C is heated and slipped over an aluminum rod with a diameter of 10.01 cm at 20.0°C. Assuming the average coefficients of linear expansion are constant. (a) To what temperature must this combination be cooled to separate the two metals? °C (b) To what temperature must this combination be cooled to separate the two metals if the aluminium rod were 10.05 cm in diameter?