Which of the following practices would definitely reduce the rate at which fossil fuels are consumed by a household A. using gasoline instead of natural gas to power the family car
B. using a home's electrical outlets instead of gasoline to power lawn equipment
C. using a coal-fired furnace instead of a wood-burning fireplace to heat a home
D. using solar energy instead of natural gas to heat water ​

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 =