A Person Is Walking Outdoors on a Cold Day When

Multiple Choice

A person is walking outdoors on a cold day when the temperature is -20°C. Each time he breathes, he inhales 0.0050 m³ of air. He is breathing at the rate of 16 breaths per minute. At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature (37°C) before it is exhaled? The specific heat of air is 1020 J/(kg∙K) and the density of air is 1.29 kg/m³.

A) 60 W
B) 90 W
C) 100 W
D) 150 W
E) 300 W