Air is initially at a temperature of 500 K and a pressure of 100 kPa. A process occurs so that the specific internal energy of the air increases by 200 kJ/kg (i. e. u2 - u1 = 200 kJ/kg). Modeling the air as an Ideal Gas, determine the final temperature assuming a) constant specific heat equal to the value at 300 K, b) constant specific heat equal to the value at the average temperature during the process, c) using third order polynomial expression table A-2c, d) variable specific heat by using properties on Table A-17.

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

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A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?