Reread the different bottle properties found underlined at the top of the first page. Which of the two properties tested is more important in making a good insulated bottle, silvered or evacuated and why? Properties: Each bottle was designed with different properties:
Bottle A: Silvered, evacuated
Bottle B: Silvered, not evacuated
Bottle C: Not silvered, evacuated
Bottle D: Not silvered, not evacuated

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 =