A rigid horizontal bar ABC is supported by three vertical rods as shown. The system is stress free before the load is applied. After the load P is applied, the temperature of all three rods is raised by the indicated ΔT. Determine
(a) the internal force in rod (1).
(b) the normal stress in rod (2).
(c) the normal strain in rod (1).
(d) the downward deflection of the rigid bar at B.
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