A Jogger Is Running Outdoors on a Cold Day When

question 39

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 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°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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Definitions:

Molecules

Electrically neutral groups of two or more atoms held together by chemical bonds, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Toxin

A poisonous substance produced within living cells or organisms that can cause disease when introduced into the body tissues.

Organic Compound

A chemical compound containing carbon atoms bonded to other elements like hydrogen, often found in living organisms.

Cellular Interactions

The various ways in which cells communicate with each other, often involving specific molecules on their surfaces.