Question: A copper rod is fastened securely at both ends to immovable supports. When this rod is stretched, it will rupture when a tensile stress of

A copper rod is fastened securely at both ends to immovable supports. When this rod is stretched, it will rupture when a tensile stress of 2.3 107 N/m2 is applied at each end. The rod just fits between the supports, so initially there is no stress applied to the rod. The rod is then cooled. What is the magnitude |T| of the change in temperature of the rod when it ruptures?

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