62 m3/s of air enters a combustion chamber of a jet engine at a velocity of 148 m/s at -25 °C and 36 kPa. The air leaves the chamber at 1,127 m/s at 367 °C. Determine the fuel (in kg) consumed during a 30 minute flight. Assume that changes in air mass flow rate through the chamber are not significant and LaTeX: \Delta h\cong C_P\Delta T. Take the air gas constant to be 0.287 kPa. m3/kg. K , the specific heat of air to be 1 kJ/(kgK) and the heating value of the fuel to be 44,823 kJ/kg. Give your answer to the nearest kg.

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?