Heat and Thermodynamics 2 Question 6
9. Steel wire of length at is suspended from the ceiling and then a mass is hung from its free end. The wire is cooled down from to to regain its original length . The coefficient of linear thermal expansion of the steel is , Young’s modulus of steel is and radius of the wire is . Assume that diameter of the wire. Then the value of in is nearly.
(2011)
Analytical & Descriptive Questions
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Answer:
Correct Answer: 9.
Solution:
Increase in length
To regain its original length,
Substituting the values we get,