At what temperature (in Celsius) will the compound bar touch the rigid support A?

A compound bar is supported by rigid supports at A and C. A 3 mm gap exists between bar (1) and the support at A, at a temperature of 5 .C. Bar 1 have the following properties: L1 = 540 mm, A1 = 12,000 mm2, E1 = 70 GPa, and a1 = 150 x 10 - 6/C. Bar 2 have the following properties: L2 = 360 mm, A2 = 15,000 mm2, E2 = 50 GPa, and a2 = 65 x 10 - 6/C. Indicate negative if under compression or if the member contracted. (25 Points) 3-mm gap (1) (2) B C A 540 mm 360 mm