Multiple-Concept Example 8 reviews the approach that is used in problems such as this. A person eats a dessert that contains 210 Calories. (This "Calorie" unit, with a capital C, is the one used by nutritionists; 1 Calorie 4186 J. See Section 12.7.) The skin temperature of the person is 37 °C and that of her environment is 23 °C. The emissivity of her skin is 0.67 and its surface area is 1.2 m2. How many hours would it take her to emit a net radiant energy from her body that is equal to the energy contained in this dessert? Heat from environment Heat from person

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