C. If the individual's metabolic rate is 80 kcal/hr (93.0 w), and breathing accounts for a loss of 10 kcal/hr (11.6 W), how much additional heat must be lost by evaporation to keep the body core temperature constant? 46. Consider a person sitting nude on a beach in Florida. On a sunny day, radiation energy from the sun is absorbed by the person at the rate of 30 kcal/hr or 34.9 W. The air temperature is a warm 30 °C, and the individual's skin temperature is 32 °C. The effective body surface area exposed to the sun is 0.9 m2. A. Find the net energy gain or loss from the radiation each hour. (Ky = 5 kcal/m².hr.C) B. If there is a 4 m/s breeze, find the energy lost by convection each hour. 45. A. What is the energy required to walk a distance of 50 km at a rate of 5 km/hr? (Specialize this problem to your own body by calculation your own body surface area) B. Assuming an energy equivalent of your food of 2.1x10?J/kg (5 kcal/g), calculate the amount of food needed for the walk.
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