El calor específico del material A es de 0.113cal/g*°C y del material B es de 0.217 cal/g*°C. Si tenemos una masa de 200gramos del material A y B, el cambio en la
temperatura en 1°C para ambos materiales. Calcula el cambio de calor en ambos materiales.

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 =