Overall, 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated. The mechanisms of elimination are radiation, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction, and convection. A person working out in a gym has a metabolic rate of 2,500 kJ/h. His body temperature is 37C, and the outside temperature 22C. Assume the skin has an area of 2.0 m and emissivity of 0.97. ( = 5.6696 108 W/m. K) (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) W 183.06 (b) If he eliminates 0.46 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) 310.5 W (c) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) 10.6 W (d) At what rate must the remaining excess energy be eliminated through conduction and convection? 51.4 W