A Student Is Sleeping Under a Small Goose-Down Comforter That

question 38

Multiple Choice

A student is sleeping under a small goose-down comforter that has thermal conductivity of 0.025 W/m °C. The thickness of the down comforter is 5.0 cm and the area of the comforter is 2.0 m². If the temperature difference between inside of the comforter and the outside of the comforter 40 °C, then what is the rate of heat flow through the comforter?

• A) 10 W
• B) 20 W
• C) 30 W
• D) 40 W
• E) 50 W

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