1. The problem statement, all variables and given/known data I'm supposed to estimate at what temp. copper will have the same resistivity as tungsten at 20 deg. C. 2. Relevant equations The only equation I think is relevant is p=p0[1+alpha(T-T0)] 3. The attempt at a solution I know the resistivity of both copper and tungsten at 20 degrees C. I just don't know what I should do about the resistivity, p0, at temperature, T0 since I don't know either of those quantities. I cant cancel those variables out when I set p(tungsten)=p(copper) so I'm not sure what to do.