A Jogger Is Running Outdoors on a Cold Day When

question 7

Multiple Choice

A jogger is running outdoors on a cold day when the temperature is -20.0°C.She is breathing at the rate of 25 breaths per minute,and each time she breathes in she inhales 0.00450 m³ of air.How much thermal energy 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°C before it is exhaled? The specific heat of air is 1020 J/kg ∙ K and the density of air under typical conditions is 1.29 kg/m³.

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

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