In this problem you will consider the balance of thermal energy radiated and absorbed by a person. Assume that the person is wearing only a skimpy bathing suit of negligible area. As a rough approximation, the area of a human body may be considered to be that of the sides of a cylinder of length L=2.0m and circumference C=0.8m. For the Stefan-Boltzmann constant use σ=5.67×10−8W/m2/K4.
If the surface temperature of the skin is taken to be Tbody=30∘C, how much thermal power Prb does the body described in the introduction radiate? Take the emissivity to be e=0.6. Express the power radiated into the room by the body numerically, rounded to the nearest 10 W.
I did try this, and got 920 W as my answer but it is incorrect.
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P= e x (stefan constant) x (temp in kelvin)^4 x (area)
ReplyDelete= 0.6 x 5.67times 10 to the -8 x (303)^4 x (0.8 x 2) =460
P= e x (stefan constant) x (temp in kelvin)^4 x (area)
ReplyDelete= 0.6 x 5.67times 10 to the -8 x (303)^4 x (0.8 x 2) =460