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30 April, 14:16

A 19 cm long, 10 mm diameter string was found to stretch 3.5 mm under a force of 16 N. The string breaks at a force of 42 N. What is the stress in the string What is the strain in the string under a 13 N load? What is the modulus of elasticity of the string? (include units with answer) What is the ultimate strength D. (stress) of the string?

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  1. 30 April, 16:19
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    Stress = 165,521 Pa

    Strain = 0.015

    Modulus of Elasticity = 11,034,742.72 Pa

    Ultimate Tensile Stress = 534,761 Pa

    Explanation:

    Stress @ Force = 13 N

    F = kΔx ... Eq 1

    Evaluate k @ F = 16 N and Δx = 0.0035m

    k = 16 N / 0.0035 m = 4571.43 N/m

    Stress = Force / Area ... Eq 2

    Stress = 13 N * 4 / π (0.01²) = 165,521.1408 Pa

    Strain @ Force = 13 N

    Strain = Δx / original Length = (F / k) / original Length

    Hence,

    Strain = (13 N / 4571.43 N / m) / 0.19 m = 0.015

    Modulus of Elasticity (E)

    E = Stress / Strain

    E = 165,521.1408 Pa / 0.015 = 11,034,742.72 Pa

    Ultimate Tensile Stress

    Max Stress that can be achieved by a material

    Stress = Fmax/Area

    Stress = 42 N * 4 / π (0.01²) = 534,761 Pa
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