simple pin-connected truss is loaded and supported as shown. The truss is constructed from three aluminum members, each having a cross-sectional area of A = 1600 mm2. Assume a = 2.4 m, b = 9.1 m, and c = 3.5 m. If P = 40 kN and Q = 90 kN, determine the normal stress in each member.

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Q: 20 kN/m 80 kN/m A D |B 3 m 1 m 1 m

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Q: 2cm 6cm 2cm 6cm

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Properties of materials

A property of a material describes its characteristics and distinguishes it from the others. The material properties are described it in terms of its hardness, color, appearances, and so on. The material properties generally depend on the type of material, or whether it is a metal or an alloy. There are different kinds of material properties such as mechanical properties, thermal properties, physical properties, and chemical properties. Chemical properties describe the material in terms of a chemical change. The mechanical properties come into existence when the material is acted upon by an external load. Thermal properties are associated with the temperature of the material and specific heat.