Air is heated in a 1-meter-long, 4 mm by 16 mm rectangular duct. the air inlet temperature is 27 °c and the air mass flow rate is 0.0003 kg/s. a uniform heat flux of 600 w/m^2 is imposed on the duct surface. determine the average temperature of the air and the surface temperature of the duct at the duct exit.

Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody