Penguin huddling. To withstand the harsh weather of the Antarctic, emperor penguins
Chapter 18, Problem 64(choose chapter or problem)
Penguin huddling. To withstand the harsh weather of the Antarctic, emperor penguins huddle in groups (Fig. 18-50). Assume that a penguin is a circular cylinder with a top surface area a 0.34 m2 and height h 1.1 m. Let Pr be the rate at which an individual penguin radiates energy to the environment (through the top and the sides); thus NPr is the rate at which N identical, wellseparated penguins radiate. If the penguins huddle closely to form a huddled cylinder with top surface area Na and height h, the cylinder radiates at the rate Ph. If N 1000, (a) what is the value of the fraction Ph/NPr and (b) by what percentage does huddling reduce the total radiation loss? Figure 18-50 64.
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