A Person Is Walking Outdoors on a Cold Day When

question 53

Multiple Choice

A person is walking outdoors on a cold day when the temperature is -20°C. Each time he breathes, he inhales 0.0050 m³ of air. He is breathing at the rate of 16 breaths per minute. At what rate does he lose heat from breathing if the air in his 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) 60 W
• B) 90 W
• C) 100 W
• D) 150 W
• E) 300 W

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Definitions:

Average Cost

The total cost of production divided by the number of goods produced, serving as a measure of cost efficiency in production.

Price-Taker Market

A market situation where individual buyers or sellers have no power to influence the price at which they buy or sell goods or services.

Economic Losses

Financial losses suffered by an entity, often resulting from poor investment decisions, market downturns, or operational inefficiencies.

Economies of Scale

Reductions in the firm’s per-unit costs associated with the use of large plants to produce a large volume of output.