Question

 A 30 kg male emperor penguin under a clear sky in the BIO Antarctic winter loses very little heat to the environment by convection; its feathers provide very good insulation. It does lose some heat through its feet to the ice, and some heat due to evaporation as it breathes; the combined power is about 12 W The outside of the penguin's body is a chilly -22°C, but its sur- roundings are an even chillier -38°C. The penguin's surface area is 0.56 m2, and its emissivity is 0.97. 

a. What is the net rate of energy loss by radiation? 

b. If the penguin has a 45 W basal metabolic rate, will it feel warm or cold under these circumstances?

Answer 1