A carpenter builds an exterior house wall with a layer of wood 3.0 cm thick on the outside and a layer of Styrofoam™ insulation 2.2 cm thick on the inside wall surface. The wood has a thermal conductivity of 0.080 W/(m·K), and the Styrofoam™ has a thermal conductivity of 0.010 W/(m·K). The interior surface temperature is 19.°C, and the exterior surface temperature is −10.0°C. (a) What is the temperature at the plane where the wood meets the Styrofoam™? (b) What is the rate of heat flow per square meter through this wall?
A carpenter builds an exterior house wall with a layer of wood 3.0 cm thick on the outside and a layer of Styrofoam™ insulation 2.2 cm thick on the inside wall surface. The wood has a thermal conductivity of 0.080 W/(m·K), and the Styrofoam™ has a thermal conductivity of 0.010 W/(m·K). The interior surface temperature is 19.°C, and the exterior surface temperature is −10.0°C. (a) What is the temperature at the plane where the wood meets the Styrofoam™? (b) What is the rate of heat flow per square meter through this wall?
A carpenter builds an exterior house wall with a layer of wood 3.0 cm thick on the outside and a layer of Styrofoam™ insulation 2.2 cm thick on the inside wall surface. The wood has a thermal conductivity of 0.080 W/(m·K), and the Styrofoam™ has a thermal conductivity of 0.010 W/(m·K). The interior surface temperature is 19.°C, and the exterior surface temperature is −10.0°C. (a) What is the temperature at the plane where the wood meets the Styrofoam™? (b) What is the rate of heat flow per square meter through this wall?
What is the rate of heat conduction through the 3.61-cm-thick fur of a large animal having a 1.29~\text{m}^21.29 m2 surface area? Assume that the animal’s skin temperature is 32.0^\circ\text{C}32.0∘C, that the air temperature is -5.00^\circ\text{C}−5.00∘C, and that fur has the same thermal conductivity as air.
Select the correct answer
58.4
W
23.2
W
41.3
W
30.4
W
74.0
W
A picture window has dimensions of 1.40 m × 2.50 m and is made of glass 5.20 mm thick. On a winter day, the outside temperature is -20.0°C, while the inside temperature is a comfortable 19.5°C. (a) At what rate is heat being lost through the window by conduction? (b) At ehat rate would heat be lost through the window if you covered it with a 0.750 mm thick layer paper (thermal conductivity 0.0500 W/m•K)?
Animal tissue helps prevent excessive heat loss by conduction. In species 1, the outer tissue has thermal conductivity k1, cross-sectional area A1, and thickness x1. In species 2, the outer tissue has thermal conductivity k2, cross-sectional area A2, and thickness x2. For the same difference between internal and external temperatures, how is the rate of heat loss in species 2 (P2) related to that in species 1 (P1)?
Group of answer choices
P2 = (A1/A2) (x1/x2) (k2/k1) P1
P2 = (A2/A1) (x1/x2) (k2/k1) P1
P2 = (A1/A2) (x2/x1) (k2/k1) P1
P2 = (A2/A1) (x2/x1) (k2/k1) P1
P2 = (A2/A1) (x1/x2) (k1/k2) P1
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