A Walk in the Sun. Consider a poor lost soul walking at 5 km/h on a hot
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(a) Calculate the net rate (in Watts) at which the person's skin is heated by all four of these mechanisms. Assume that the emissivity of the skin is e = 1 and that the skin temperature is initially 36°C. Which mechanism is the most important?
(b) At what rate (in µ/h) must perspiration evaporate? From this person's skin to maintain a constant skin temperature (The heat of vaporization of water at 36°C is 2.42 X 106 J/kg.)
(c) Suppose instead the person is protected by light-colored clo1hlug (e = 0) so that the exposed skin area is only 0.45 m2 • what rate of perspiration is required now? Discuss the usefulness of the traditional clotting worn by desert peoples.
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University Physics with Modern Physics
ISBN: 978-0133977981
14th edition
Authors: Hugh D. Young, Roger A. Freedman
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