$P _ { 2 } = 10 \mathrm { kN }$

question 11

Multiple Choice

$\text { A brass rod } ( E =110 \mathrm { GPa } ) \text { with a cross-sectional area of } 250 \mathrm {~mm} ^ { 2 } \text { is loaded by forces } P _ { 1 } = 15 \mathrm { kN }$ $P _ { 2 } = 10 \mathrm { kN }$ , and $P _ { 3 } = 8 \mathrm { kN }$ . Segment lengths of the bar are $a = 2.0 \mathrm {~m} , b = 0.75 \mathrm {~m}$ , and $c = 1.2 \mathrm {~m}$ . 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

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Definitions:

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