The cylinder CD of the assembly is heated from T₁= 30°C to T₂= 180°C using electrical resistance. Also, the two end rods AB and EF are heated from T₁= 30°C to T₂= 50°C. At the lower temperature T1 the gap between C and the rigid bar is 0.7 mm. Determine the force in rods AB and EF caused by the increase in temperature. 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. E_st= 200 GPa, E_al= 70 GPa, α_st= 12(10^-6)/°C, and α_al= 23(10^-6)/°C.

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0.7 mm BLO 240 mm 300 mm A