# The center rod CD of the assembly is heated from T1 = 30 °C to T2...

###### Question:

The center rod CD of the assembly is heated from T1 = 30 °C to T2 = 185 °C using electrical resistance heating. At the lower temperature Ti the gap between C and the rigid bar is 0.7 mm. Rods AB and EF are made of steel, and each has a cross- sectional area of 125 mm². CD is made of aluminum and has a cross-sectional area of 375 mm². Est = 200 GPa, Eal = 70 GPa, and @al = 23(10-6)/°C. (Figure 1) Figure 1 of 1 0.7 mm BLOL 240 mm|| 300 mm
Part A Determine the force in the rod AB caused by the increase in temperature. Express your answer to three significant figures and include the appropriate units. CHA MO O ? FAB = 12.97 kN

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