A Jogger Is Running Outdoors on a Cold Day When $- 20.0 ^ { \circ } \mathrm { C }$

question 68

Multiple Choice

A jogger is running outdoors on a cold day when the temperature is $- 20.0 ^ { \circ } \mathrm { C }$ she is breathing at the rate of 25 breaths per minute, and each time she breathes in she inhales $0.00450 \mathrm {~m} ^ { 3 }$ of air. How much heat does she lose from breathing during 20.0 minutes of jogging if the air in her lungs is heated to her body temperature of $37.0 ^ { \circ } \mathrm { C }$ before it is exhaled? The specific heat of air is $1020 \mathrm {~J} / \mathrm { kg }$ K and the density of air under typical conditions is $1.29 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

• A) 278 kJ
• B) 354 kJ
• C) 169 kJ
• D) 543 kJ
• E) 431 kJ

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