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625 mm 30 kN 30 kN B PROBLEM 2.39 30 mm A polystyrene rod consisting of two cylindrical portions AB and BC is restrained

625 mm 30 kN 30 kN B PROBLEM 2.39 30 mm A polystyrene rod consisting of two cylindrical portions AB and BC is restrained at both ends and supports two 30-kN loads as shown. Knowing that E 3.1 GPa, determine (a) the reactions at A and C, (b) the normal stress in each portion of the 50 mm rod. 375 mm C

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