The wires AB and AC are made of steel, and wire AD is made of copper. Before the 150-lb force is applied, AB and AC are each 60 in. long and AD is 40 in. long. If the temperature is increased by 80€‘F, determine the force in each wire needed to support the load. Each wire has a crosssectional area of 0.0123 in². Take E_st= 29(10³) ksi, E_cu= 17(10³) ksi, α_st= 8(10^€“6)/°F, α_cu= 9.60(10^€“6)/°F.

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B' ND °C 40 in. 60 in. 60 in. 45°-45° SA V150 lb