24. The uniaxial bar shown below can be modeled as a one-dimensional truss. The bar has the following properties: L = 1 m, A = 10~4m2, E = 100 GPa, and a = IQ-A/0C. From the stressfree initial state, a force of 5,000 N is applied at Node 2 and the temperature is lowered by 100oC below the reference temperature.

(a) Calculate the global matrix equation after applying boundary conditions.

(b) Solve for the displacement wi.

(c) What is the element force P in the bar?