A copper wire of cross section area 0.04 cm^2 and length 1.2 m is heated from the room temperature 20 C to 40 C. Find
a) the change of its length in the process;
b) the force needed at each end if it were stretched at T = 20 C with the same extension. (The coefficient of linear expansion for copper is 1.7 X 10^-5 / k. The Young's modulus for copper is 1.1 x 10 ^11 N/m^2.)


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