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1. A walrus transfers energy by conduction through its blubber at the rate of 135 W when immersed in -1 deg C water. The walrus's internal core temperature is 36 deg C, and it has a surface area of 2.5 m². What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood (k=0.2 J/(s m °C))? d= v cm

1. Radiation makes it impossible to stand close to a hot lava flow. Calculate the rate of heat transfer by radiation from 2 m² of 1197 deg C fresh lava into 30 deg C surroundings, assuming lava's emissivity is 0.8. o=5.67x10-8 J/(5 m2 °C) Use the sign convention for heat leaving or entering the system. kW