A brass rod (E 5 110 GPa) with a cross-sectional area of 250 mm2 is loaded by forces P1 5 15 kN P2 5 10 kN, and P3 5 8 kN. Segment lengths of the bar are a 5 2.0 m, b 5 0.75 m, and c 5 1.2 m. The change in length of the bar is approximately:
(A) 0.9 mm
(B) 1.6 mm
(C) 2.1 mm
(D) 3.4 mm
(A) 0.9 mm
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A. 
B. 
C. 
D. 
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