Steel wire of length 'L' at 50 0C is suspended from the ceiling and then a mass 'm'
is hung from its free end. The wire is cooled down from 500C to 400C to regain its original
length ′L′. The coefficient of linear thermal expansion of the steel is 10-5/ 0C, Young's modulus
of steel is 1011N/m2 and radius of the wire is 1 mm. Assume that L>> diameter of the wire.
Then the value of 'm' in kg is nearly
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