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A Brass Wire (D = 2 19.5×106/C19.5 \times 10^{-6} /{ }^{\circ} \mathrm{C}

question 11

Short Answer

A brass wire (d = 2.0 mm, E = 110 GPa) is pretensioned to T = 85 N. The coefficient of thermal expansion for the wire is 19.5×106/C19.5 \times 10^{-6} /{ }^{\circ} \mathrm{C} . The temperature change at which the wire goes slack is
Approximately: (A) +5.7C +5.7^{\circ} \mathrm{C}
(B) 12.6C -12.6^{\circ} \mathrm{C}
(C) +12.6C +12.6^{\circ} \mathrm{C}
(D) 18.2C -18.2^{\circ} \mathrm{C}

 A brass wire (d = 2.0 mm, E = 110 GPa) is pretensioned to T = 85 N. The coefficient of thermal expansion for the wire is  19.5 \times 10^{-6} /{ }^{\circ} \mathrm{C}  . The temperature change at which the wire goes slack is Approximately: (A)   +5.7^{\circ} \mathrm{C}   (B)   -12.6^{\circ} \mathrm{C}   (C)   +12.6^{\circ} \mathrm{C}   (D)   -18.2^{\circ} \mathrm{C}


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