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A steel wire of 2.0 mm2 cross-section is held straight (but under no tension) by attaching it firmly to two points a distance 1.50 m apart at 30 °C. If the temperature now decreases to -10 °C, and if the two tie points remain fixed, what will be the tension in the wire? For steel, a = 1.1 x 10-5 °C-1 and Y = 2.0 x 10^11 N/m2. |
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