The rectangular door of a kitchen oven is 60 cm tall and 75 m wide. When in operation, the external surface of the oven door is at 77 C. For air in the room the thermal conductivity is 0.02815 W/m K. if the temperature of the room is 27 C and the Nusselt number which describes the convection heat transfer between the door and the room Nul is 7755, what is the convective heat transfer rate between the oven and the room

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

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