Hot air flows through a pipe, as shown above. the properties of air may be taken as: k=0.03 w/m-k, pr=0.7, μ=208.2 x 10"n s/m^2 and ρ=0995 kg/m^3. calculate heat transfer coefficient between the inner surface of the pipe and the hot air.

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]