Thermal conductivity k (9%) Problem 10: Suppose a house's walls are 13 cm thick and and have an average thermal conductivity twice that of glass wool. Substance (J/s•m C) Glass wool Wool 0.042 0.04 Glass 0.84 Human body Ceramic Wood Air Fatty tissue 0.2 0.84 0.08-0.16 0.023 0.2 Styrofoam 0.010 ©theexpertta.com 50% Part (a) Calculate the rate of heat conduction, in watts, through the house's walls. Assume there are no windows or doors. The surface area of the walls is 140 m² and their inside surface is at 18.5°C, while their outside surface is at 5.15°C. Grade Summary Q'At = Deductions 0% 100% Potential sin() cos() tan() 9 HOME Submissions Attempts remaining: 10 (0% per attempt) detailed view cotan() asin() acos() E 4 5 atan() acotan() sinh() cosh() tanh() cotanh() END ODegrees O Radians VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining:1 Feedback: 0% deduction per feedback. 50% Part (b) How many 1.00-kW room heaters would be needed to balance the heat transfer due to conduction? Round your answer to the nearest integer value. 63 2. 1.

Thermal conductivity k (9%) Problem 10: Suppose a house's walls are 13 cm thick and and have an average thermal conductivity twice that of glass wool. Substance (J/s•m C) Glass wool Wool 0.042 0.04 Glass 0.84 Human body Ceramic Wood Air Fatty tissue 0.2 0.84 0.08-0.16 0.023 0.2 Styrofoam 0.010 ©theexpertta.com 50% Part (a) Calculate the rate of heat conduction, in watts, through the house's walls. Assume there are no windows or doors. The surface area of the walls is 140 m² and their inside surface is at 18.5°C, while their outside surface is at 5.15°C. Grade Summary Q'At = Deductions 0% 100% Potential sin() cos() tan() 9 HOME Submissions Attempts remaining: 10 (0% per attempt) detailed view cotan() asin() acos() E 4 5 atan() acotan() sinh() cosh() tanh() cotanh() END ODegrees O Radians VO BACKSPACE DEL CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining:1 Feedback: 0% deduction per feedback. 50% Part (b) How many 1.00-kW room heaters would be needed to balance the heat transfer due to conduction? Round your answer to the nearest integer value. 63 2. 1.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Energy transfer

The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.

Molar Specific Heat

Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)

Thermal Properties of Matter

Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.

Question

(9%) Problem 10: Suppose a house's walls are 13 cm thick and and have an average thermal
conductivity twice that of glass wool.
Thermal conductivity k
(J/s• m C)
Substance
Glass wool
Wool
0.042
0.04
Glass
0.84
Human body
Ceramic
Wood
Air
Fatty tissue
Styrofoam
0.2
0.84
0.08-0.16
0.023
0.2
0.010
©theexpertta.com
50% Part (a) Calculate the rate of heat conduction, in watts, through the house's walls. Assume there are no windows or doors. The surface area of the
walls is 140 m² and their inside surface is at 18.5°C, while their outside surface is at 5.15°C.
Grade Summary
Deductions
Potential
QAt =
0%
100%
*( 7 8 9
E 4
sin()
Submissions
cos()
asin()
tan()
HOME
cotan()
Attempts remaining:
(0% per attempt)
detailed view
acos()
5
6
atan()
acotan()
sinh()
cotanh()
1
2
cosh()
tanh()
- 0
END
Degrees
Radians
VO BACKSPACE
DEL
CLEAR
Submit
Hint
Feedback
I give up!
Hints: 0% deduction per hint. Hints remaining: 1
Feedback: 0% deduction per feedback.
50% Part (b) How many 1.00-kW room heaters would be needed to balance the heat transfer due to conduction? Round your answer to the nearest integer
value.

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