A hot wire of copper is stretched at a temperature of 150ºC between two fixed walls. At what temperature will the wire break when it is cooled? The breaking stress of copper is 2.45 × 10 8 N/m 2 Young's modulus of copper = 11.8 × 10 10 N/m 2 , coefficient of linear expansion of copper = 1.6 × 10 –5 /ºC.
Text Solution
Verified by ExpertsThe correct answer is:
A
2.45 × 10 8 = Y α Δ T = 11.8 × 10 10 × 1.6 × 10 –5 × Δ T
Δ T = 
= 129.77 0 C
so. T Lower = 20.23 0 C
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