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Physics / Sears and Zemansky's University Physics with Modern Physics 13 / Chapter 20 / Problem 48P

Sears and Zemansky's University Physics with Modern Physics | 13th Edition | ISBN: 9780321696861 | Authors: Hugh D. Young; Roger A. Freedman; A. Lewis Ford

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Solved: BIO Human Entropy. A person with skin of surface

Chapter 20, Problem 48P

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QUESTION:

Problem 48P

BIO Human Entropy. A person with skin of surface area 1.85 m2 and temperature 30.0°C is resting in an insulated room where the ambient air temperature is 20.0°C. In this state, a person gets rid of excess heat by radiation. By how much does the person change the entropy of the air in this room each second? (Recall that the room radiates back into the person and that the emissivity of the skin is 1.00.)

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QUESTION:

Problem 48P

BIO Human Entropy. A person with skin of surface area 1.85 m2 and temperature 30.0°C is resting in an insulated room where the ambient air temperature is 20.0°C. In this state, a person gets rid of excess heat by radiation. By how much does the person change the entropy of the air in this room each second? (Recall that the room radiates back into the person and that the emissivity of the skin is 1.00.)

ANSWER:

Solution 48P

Step 1:

Surface area of the person A = 1.85 m2

Temperature of the person T = 30.0°C or 303K

Temperature of the surrounding (room) TS = 20.0°C or 293K

Emissivity of the skin e = 1

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