1. T (x) = a + bx + cx2 in a place with a thickness in a place with L = 0.3m inside thickness. In this equation T is the temperature units of Celsius and x meters are given as a = 200 ° C, b = -200 ° C / m, c = 30 ° C / m2. Thermal conductivity of the wall coefficient k = 1 W / m. K. a) The kiosk is outside, losing heat to the outside and outside, bedroom stored calculation. b) What is the heat transfer coefficient when the branch of the wall comes into contact with a fluid having a temperature of 100 ° C at x = L?

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?