A square rod is 2 m long and 0.5 m by 0.5 m in cross section. It elongates by 0.5 mm when subject to a tensile load P. The normal longitudinal strain is most nearly:

the normal longitudinal strain is most nearly 2.5 x 10⁻⁴ mm/mm

Explanation:

Given the data in the question,

we know that;

Normal longitudinal strain = elongation / original length

so we substitute our values

Normal longitudinal strain = 0.5 mm / (2 m x 1000) mm

= 0.5 mm / 2000 mm

= 2.5 x 10⁻⁴ mm/mm

Therefore the normal longitudinal strain is most nearly 2.5 x 10⁻⁴ mm/mm

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explanation: