A gas whose pressure, volume and temperature are 275 kN/㎡, 0.09m³ and 185°C, respectively, has its state changed at constant pressure until its temperature becomes 15 °C. How much heat is transferred from the gas and how much work is done on the gas during the process? Take R=0.29 kj/kgK, Cp=1.005 kj/kg K

Consider the growth of a 20-nm-diameter silicon nanowire onto a silicon wafer. the temperature of the wafer surface is maintained at 2400 k. assume the thermal conductivity of the silicon nanowire is 20 wm-1k-1 and all its surfaces including the tip are subjected to convection heat transfer with the coefficient h = 1×105 wm-2k-1 and t∞ = 8000 k. when the nanowire grows to l = 300 nm, what is the temperature of the nanowire tip (t (x =