Asteel strip emerges from the hot roll section of a steel mill at a speed of 20 m/s and a temperature of 1200 k. its length at a speed of 20 m/s and a temperature of 1200 k. its length and thickness are l = 100 m and delta = 0.003 m respectively, and its density and specific heat are 7900 kg/m3 and 640 j/kgk respectively. neglecting effect of conduction and radiation, and considering only convection from both top and bottom surfaces, determine the time rate of change of the strip temperature at a distance of 1 m from the leading edge and at the trailing edge. also determine the distance from the leading edge at which the minimum cooling rate is achieved.