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Unformatted text preview: muffins can he burn if he climbs up the Grouse Grind (elevation 800 m, trail length 2.9 km) compared to when he is watching TV? The caloric intake of the muffin is 400 kcal. Humans convert the chemical energy of the food to mechanical energy with 20% efficiency. 5. Two surveyors are working in the Canadian arctic when a snowstorm blows in. To help survive the cold they build themselves an Igloo. (An Igloo is a shelter constructed from blocks of snow, generally in the form of a dome. Although igloos are usually associated with all Inuit people, they were predominantly constructed by people of Canada's Central Arctic and Greenlands Thule area.) The total wall and roof area of the Igloo is 25 m 2 and the average R value is 25. What is the temperature inside while it is -30C outside? State clearly all the assumptions that you made while solving this problem. Notice: Make sure that you express R value in the appropriate units....
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- Spring '09