This is essentially a continuation of the previous Q&A example.

The emissivity of the human body is about 0.95 and the surface area of an average male is about 1.75 m2. Normal body temperature is 37oC but skin temperatur is slightly lower, 35oC = 308 K.

In the previous Q&A we found that this typical man emits radiation at the rate of about 850 W.

If this same typical man is in surroundings that are at 25oC, he also absorbs heat.

What is the rate at which this man absorbs heat?

Rasorb = 100 W

Rasorb = 250 W

Rasorb = 540 W

Rasorb = 740 W

(c) 2000, Doug Davis; all rights reserved