A block weighing \(42 \mathrm{kN}\) is supported by three wires as shown in Fig. 13.50. The two outer steel wires have an area of \(100 \mathrm{~mm}^{2}\) each, whereas the middle aluminium wire has an area of 200 \(\mathrm{mm}^{2}\). Calculate the stresses in the wires. Take \(E_{s}=200 \mathrm{GPa}\) and \(E_{a}=80 \mathrm{GPa}\).

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Steel Steel 0.5 m 42 kN Fig. 13.50