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We would like to increase the length of a 15 cm long copper rod of cross section `4mm^2` by 1 mm. The energy absorbedd by the rod if it is heated is `E_1`. The energy absorbed by the rod if it is stretched slowly is `E_2`. Then find `E_1//E_2`. [Variaous parameters of copper are density `=9xx10^3 Kg//m^(3)`, thermal coefficient of linear expansion `=16xx10^-6//K`, Young's modulus `=135xx190Pa`, specific heat `= 400 J//kg-K`]

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We would like to increase the length of a 15 cm long copper rod of cross section 4mm^2 by 1 mm. The energy absorbed by the rod if it is heated is E_1 . The energy absorbed by the rod if it is stretched slowly is E_2 . Then find E_1//E_2 . [Various parameters of copper are density =9xx10^3 Kg//m^(3) , thermal coefficient of linear expansion =16xx10^-6//K , Young's modulus =135xx190Pa , specific heat = 400 J//kg-K ]

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