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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=5.67x10^-8W/m2/K4.

A ) If the surface temperature of the skin is taken to be Tbody=30^oC, 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.

B) Find Pnet, the net power radiated by the person when in a room with temperature Troom=20^oC. Express the net radiated power numerically, to the nearest 10 W.

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