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Q. 37

Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 544

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Short Answer

Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. If the body’s surface temperature is 35°C, what is the net rate of heat loss on a chilly 5°C day? All skin, regardless of color, is effectively black in the infrared where the radiation occurs, so use an emissivity of 0.95.

The accurate answer is 25.6 W.

See the step by step solution

Step by Step Solution

Step 1: Given Information


Diameter of the head,

Therefore, radius,

Height of the head,


Surface temperature of the body,

Ambient temperature,

Step 2: Calculation

On the basis of temperature

On the basis of provided information:

On the basis of substituting numerical case

Therefore, the accurate answer is 25.6 W.

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