1) The walls of a house are 11 cm thick and have an average thermal conductivity two times that of cork. The walls' surface area is 850000 cm2 and their inside surface is at 18 °C, while their outside surface is at 4°C. (Thermal conductivity of cork is 0.036 W/m°C). Calculate, (i) The rate of heat conduction through house walls in Watts: (ii) Amount of heat conducted in Joules, in 5 min:

University Physics Volume 2
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Chapter1: Temperature And Heat
Section: Chapter Questions
Problem 97P: Compare the rate of heat conduction through a 13.0-cm-thick wall that has an area of 10.0 m2 and a...
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1) The walls of a house are 11 cm thick and
have an average thermal conductivity two
times that of cork. The walls' surface area is
850000 cm2 and their inside surface is at 18
°C, while their outside surface is at 4°C.
(Thermal conductivity of cork is 0.036
W/m°C). Calculate,
(i) The rate of heat conduction through
house walls in Watts:
(ii) Amount of heat conducted in Joules, in
5 min:
2) A spherical infrared heater of radius 6.5
cm and an emissivity of 0.82 radiates 0.48
kW of power. Given, Stefan's constant =
5.67x108 Wm2K4. Calculate,
Temperature of the heater in Celsius:
Transcribed Image Text:1) The walls of a house are 11 cm thick and have an average thermal conductivity two times that of cork. The walls' surface area is 850000 cm2 and their inside surface is at 18 °C, while their outside surface is at 4°C. (Thermal conductivity of cork is 0.036 W/m°C). Calculate, (i) The rate of heat conduction through house walls in Watts: (ii) Amount of heat conducted in Joules, in 5 min: 2) A spherical infrared heater of radius 6.5 cm and an emissivity of 0.82 radiates 0.48 kW of power. Given, Stefan's constant = 5.67x108 Wm2K4. Calculate, Temperature of the heater in Celsius:
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