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Steel wire of lenght ?L? at 40°C is suspended from the ceiling and then a mass ?m? is hung from its freeend. The wire is cooled down from 40°C to 30°C to regain its original length ?L?. The coefficient of linearthermal expansion of the steel is 10-5/°C, Young?s modulus of steel is 1011 N/m2 and radius of the wire is 1mm. Assume that L diameter of the wire. Then the value of ?m? in kg is nearly
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