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27 Nov 2019

A wall is made up of 5 cm of wood and 8 cm of brick. If thetemperature difference across the wall is 27 Celsius degrees,andthe wall area is 10 m^2, how much heat, to the nearest Joule, islost through the wall in 1 hour?

If the interior wood wall in problem 4) is 30 C, what is thetemperature, to the nearest degree Celsius, of the wood/brickinterface?

You are in a 2 cm thick down sleeping bag. Assuming your bodytemperature is 100 degrees Fahrenheit and the outside temperatureis 26 degrees Fahrenheit, how much heat, to the nearest Joule, doyou lose through the bag in an hour? (Assume that the exposed areaof the bag is 2 m^2.)

Assuming you have a body surface area of 2 m^2 ,temperature of 37C, an emissivity of 1, and are surrounded by walls at a temperatureof 3 degrees C,how much energy ,to the nearest Joule, do you losein an hour by radiation exchange?

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