The emissivity of iron is approximately 0.25. If an iron cube (with a side length of 0.5 m) is heated to 200• C and is placed into a –10.C chamber then answer the following a) What is the net rate of heat loss due to radiation from the iron cube? b) If the cube is placed onto a 0.1 m thick aluminum sheet, and the ground of the chamber is assumed to be held at –10•C, how long will it take in seconds for the cube to lose 1000 J of heat via conduction to the ground? (Note: the thermal conductivity of aluminum is 240 W/(m K)).

The emissivity of iron is approximately 0.25. If an iron cube (with a side length of 0.5 m) is heated to 200• C and is placed into a –10.C chamber then answer the following a) What is the net rate of heat loss due to radiation from the iron cube? b) If the cube is placed onto a 0.1 m thick aluminum sheet, and the ground of the chamber is assumed to be held at –10•C, how long will it take in seconds for the cube to lose 1000 J of heat via conduction to the ground? (Note: the thermal conductivity of aluminum is 240 W/(m K)).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.

Question

2 part

The emissivity of iron is approximately 0.25. If an iron cube (with a side length of 0.5 m) is
heated to 200• C and is placed into a -10•C chamber then answer the following
a) What is the net rate of heat loss due to radiation from the iron cube?
b) If the cube is placed onto a 0.1 m thick aluminum sheet, and the ground of the chamber
is assumed to be held at –10•C, how long will it take in seconds for the cube to lose 1000 J of heat via
conduction to the ground? (Note: the thermal conductivity of aluminum is 240 W/(m K)).

c (J/(kg K)) | C (J/(mol K)) Lf (J/kg) | L. (J/kg) density (kg/m³)
19,300
8,960
2,700
7,500
1,000
790
Material
a (°C-1)
Gold
129
25
Copper
1.65×10-5
2.3x10-5
1.75×10-5
Aluminum
Stainless Steel
3.33x105
1.09×105
22.6x105
8.79×105
Water
4190
75
Ethyl Alcohol
2400
110
Ice
2090
37.6
917
1.01x105 Pa
1 atm =
NA = 6.022×1023 particles/mol
R = 8.3145 J/(mol K)
kB = 1.38×10-23 J/K
o = 5.67 x 10-8W/(m²K4)

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