An electrically charged resistance wire has a diameter of 2mm and a resistance of 0.10ohm per foot of wire. The thermal conductivity of the wire is 10btu/hr sq ft. At a current oof 100amp, calculate the temperature difference between the center of the wire at steady rate

The air in an automobile tire with a volume of 0.015 m3 is at 32°c and 140 kpa gage. determine the amount of air that must be added to raise the pressure to the recommended value of 206 kpa gage. assume the atmospheric pressure to be 128 kpa and the temperature and the volume to remain constant.[r-0.287 kj/kgk]