The temperature coefficient of resistivity of iron is 5 × 10-3 /°C; that of carbon is -0.5 × 10-3 /°C. When an iron wire and a carbon rod, each having the same 10 Ω resistance at 20 °C, are cooled from that temperature to -80 °C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is:

10 points! will mark brainiest! in a heat engine if 1,000 j of heat enters the system and the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2,000 j 1: write the equation 2: list out your known variables 3: plug the numbers into the equations 4: solve 5: write your solution statement that includes initial energy and final energy added you so much!