A load of 25 KN is to be supported by three equidistant vertical rods as shown. At first, all the bars are balanced to share the load equally. Dismissing any chance of buckling, determine the final stresses when an additional load of 20 KN is added. Use Esteel = 205 Gpa, Ecopper = 100 Gpa.

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A: ∑Fv=0RA+RHcos26o33'=8400+18000+1580+3160+1580cos18o26'RA+0.894RH=32395.734 lb

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