The rear window of an automobile is defogged by passingwarm air at 40ºC over its inner surface, and the associatedconvection coefficient is 30 W/(m2•K). Underconditions for which the outside ambient air temperature is-10ºC and the associated convection coefficient is 65W/(m2•K), what are the inner and outer surfacetemperatures of the window? The window glass is 4 mmthick.
(Answer given Tinside =9.3°C and Toutside =4.1°C)

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.

Tech a says never use a water hose to clean up dust after a repair. tech b says never use a floor scrubber to clean up dust after repairs. who is correct?

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window