Heat Radiated by a Person Part A If the surface temperature of the skin is taken

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Heat Radiated by a Person Part A If the surface temperature of the skin is taken to be Tbody30 °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 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 ength L2.0 m and circumference C = 0.8 m. nearest 10 W. Pb= 460 W For the Stefan-Boltzmann constant use = 5.67 x 10 8 W/m2 /K4 Submit Hints My Answers Give Up Review Part Corect

Explanation / Answer

rate of energy transer H = dQ/dt = Ae (sigma) T^4

where A = area = 4pir^2, e= emissitivity = (1 for black bdoy)

sigma = constant = 5.67*10^-8

T = tempoeratrue in kelvin

H = 0.8 * 2 * 5.67 e -8 *0.6* (20+273)^4

H = 1.6 e 5 Watts

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