The aluminum hollow length shown in the figure is 400 mm and the outer diameter is 100 mm. E = 70 Gpa a= 25x10^-4. The steel rod inside the cylinder is made of steel with a diameter of 70 mm and E-210 Gpa a=15x10^-4. Answer the questions assuming that the upper and lower plates do not shift if the temperature of the system increases by 100 C. A) What is the elongation in the steel bar due to temperature without the top plate, in mm? B) How many mm is the elongation occurring in the aluminum pipe due to the temperature effect without the top plate? C)What is the minimum force in kN that must be applied to the upper plate to align the upper surfaces of the steel rod and aluminum pipe? Aluminum Steel Aluminum