Calculate the rate of heat flow (in J/s = Watts) by conduction through a glass window 2.9 m multiplied by 3.0 m in area and 4 mm thick, if the inside temperature is 150 C and the outside temperature is 90 C. Thermal conductivityes of the glass: 2 10"kcal/sec)/(C m) 1 kcal = 4186 J Enter the magnitude, i.e. a positive integer