A heated copper bar placed in an air flow perpendicular to its axis. The characteristics of the bar are the following: Copper: p=8940 kg/m, Cp = 380 J/kg.K, = 385 W/m.K Bar: d=12mm, L= 80mm, T = 20C At the center of the bar, there is a thermocouple to record the change in the temperature. The figure and table below show the temperature variation versus time bar Temperature (C) 90 80 70 60 10- 10 20 t(s) 0 5 10 T(C) 80 72.7 663 30 40 Time (s) 15 20 25 60.6 55.7 51.3 50 60 30 35 47.5 44.2 40 41.2 t(s) 85 45 50 55 60 65 70 75 80 T(C) 38.6 72.7 34.4 32.6 31.1 29.7 28.5 27.5 26.6 1. By applying the energy balance a control volume of the bar, give an T-T expression of function of h, As, P, V, c, and t. T-T. 2. Using the values in the table calculate the coefficient of transfer h (W/m C) 3. Calculate the thermal time graphically (s) 4. Determine the coefficient of transfer graphically (W/m. C) TO