At 20C(Celsius) a sphere of iron has a diameter of 2.5545cm and a sphere of brass has a diameter of 2.5507cm. (a) What will be the diameter of each at 50C? (b) At what temperature will the two sphere have identical volumes? linear thermal expansion coefficients are given below Iron = 12*10^-6 K^-1 Brass = 19*10^-6 K^-1