Engineering Board Exam Reviewer · Engineering Mechanics · medium
A steel bar (E = 200 GPa) with a length of 2 m and a cross-sectional area of 250 mm2 carries an axial load of 15 kN. What is its elongation?
- 0.001
- 1.2
- 0.3
- 0.6
Answer
D. 0.6
Solution
= PL/(AE) = (15 × 1000 N)(2 × 1000 mm) / (250 mm2 × 200 × 1000 MPa) = 0.6 mm.
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