[ilovecheese]

Any help/hints would be fabulous! especially what T1 could be xD
thanks in advance

At a certain temperature T1, a 67.6 mm rod of a copper alloy containing 30.3 at% Ni has a resistivity of 27.6 x 10-8 Ω-m. For pure copper, the resistivity at 0°C is 1.58 x 10-8 Ω-m and the change in resistivity per degree increase in temperature is 6.50 x 10-11 (Ω-m)/°C. The value of A for nickel in copper is 1.18 x 10-6 Ω-m.
If the resistivity of this alloy is dependent only on thermal and impurity considerations, find the coefficient of thermal expansion of this alloy (in (deg C)^-1) if the rod increases in length by 0.382 mm when heated to 152°C.


here are some of my thoughts:
like now I'm thinking T1 is below 0 deg
before I assumed T1 was above it ... and thats how I got a T1 above the temp its heated to in the second part
when I do the other way I get the negative value of the T1 I had before...
but then it means they're heating it +400 deg C almost