A hiker is wearing wool clothing of 0.50-cm thickness to keep warm. Her skin temperature is 35°C and the outside temperature is 4.0°C. Her body surface area is 1.2 m2.
(a) If the thermal conductivity of wool is 0.040 W/(m ∙ K), what is the rate of heat conduction through her clothing?
(b) If the hiker is caught in a rainstorm, the thermal conductivity of the soaked wool increases to 0.60 W/(m ∙ K) (that of water). Now what is the rate of heat conduction?