Compute F1  
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The figure shows the front view and the cross section view of a brass link which is labeled 1. A steel rod labeled 2 is shown below. The inside length of the brass link is 250 millimeters. The width and the thickness of the brass link are 20 millimeters and 10 millimeters respectively. A 30 millimeters diameter steel rod is shown below. The length of the steel rod is 0.2 millimeters longer than the inside length of the brass link.

Substitute the numeric values and compute F1...

Numeric values
Temperature change

ΔT = +20°C

Brass link (1)

L1 = 250 mm
A1 = 400 mm2
E1 = 105 GPa
α1 = 20.9 × 10-6/°C

Steel rod (2)

L2 = 250 mm
A2 = 706.86 mm2
E2 = 200 GPa
α2 = 11.7 × 10-6/°C