Determine equations using the rst term approximation for the gold and silver spheres that describe their outside surface temperatures, Ts;G(t) and Ts;S(t), and center temperatures, T0;G(t) and T0;S(t), respectively.

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]