A man working out in a gym has a metabolic rate of 2500 kJ/h. His body temperature is 37°C, and the outside temperature 26°C. Suppose the skin has an area of 2.0 m2 and emissivity of 0.97. (σ =5.6696 x 10-8W/m2•K4)
(a) Determine at what rate is his excess thermal energy dissipated by radiation?
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(b) If he eliminates 0.34 kilogram of perspiration during that hour, find at what rate is thermal energy dissipated by evaporation of sweat?
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(c) Find at what rate is energy eliminated by evaporation from the lungs?
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(d) Find at what rate must the remaining excess energy be eliminated through convection and conduction?
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