A Jogger Is Running Outdoors on a Cold Day When

question 68

Multiple Choice

A jogger is running outdoors on a cold day when the temperature is -20.0°C. Each time she breathes, she inhales 0.00450 m³ of air. She is breathing at the rate of 25 breaths per minute. How much heat does she lose from breathing during 20.0 minutes of jogging if the air in her 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) 169 kJ
• B) 278 kJ
• C) 354 kJ
• D) 431 kJ
• E) 543 kJ

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