A Steel strip emerges from the hot section of a steel mill 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/m^3 and 640 J/kg. K, respectively.

Avccounting for the haet transfer from the top and tghe bottom surfaces and neglecting radiation and strip condution effects, determine the time rate of change of the strip temperature at a distance of 1 m from the leading edage and at the trailing edge. Determine the distance from the leading edge at which the minimum cooling rate is achieved.