A student is sleeping under a small goose-down comforter that has a coefficient
ID: 1382871 • Letter: A
Question
A student is sleeping under a small goose-down comforter that has a coefficient of thermal conductivity of 0.025 W/m/oC. The area of the comforter is 2.0 m2 . If the temperature difference between the inside and outside of the comforter is 40 oC and the heat flows from the inside to the outside of the comforter at a rate of 50 W, what is the thickness of the comforter? (ans: 4.0 cm)
A wood burning stove in a cabin in the woods has a surface area of 100 m2 . The stove has a temperature of 220 oC and radiates heat at a rate of 150 kW. What is the emissivity of the stove? (ans: 0.44)
Explanation / Answer
Answer 1
rate of heat flow=KA(delta T)/l
=40 W
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