A Person Is Walking Outdoors on a Cold Day When $- 20 ^ { \circ } \mathrm { C }$

question 86

Multiple Choice

A person is walking outdoors on a cold day when the temperature is $- 20 ^ { \circ } \mathrm { C }$ He is breathing at the rate of 16 breaths per minute, and each time he breathes in he inhales $0.0050 m ^ { 3 }$ of air. At what rate does he lose heat from breathing if the air in his lungs is heated to body temperature $\left( 37 ^ { \circ } \mathrm { C } \right)$ before it is exhaled? The specific heat of air is $1020 \mathrm {~J} / \mathrm { kg } \cdot \mathrm { K }$ and the density of air is $1.29 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

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

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The necessary activities that guarantee the day-to-day reproduction and survival of the population.

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