College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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An orange orb has an emissivity of 0.405 and its surroundings are at 324°C. The orange orb is absorbing heat via
![**Content**
| Substance | Latent Heat (J/kg) |
|---------------|--------------------|
| Steam ↔ water | 2,260,000 |
| Ice ↔ water | 333,000 |
Answer the following questions dealing with methods of heat transfer.
---
**Radiation**
An orange orb has an emissivity of 0.405 and its surroundings are at 324°C. The orange orb is absorbing heat via radiation at a rate of 640 W and it is emitting heat via radiation at a rate of 84 W. Determine the surface area of the orb, the temperature of the orb, & \( P_{\text{net}} \).
- \( A = .219 \, \text{m}^2 \)
- \( T_{\text{orb}} = 870.43 \, \text{K} \)
Your answer is correct.
- \( P_{\text{net}} = \) [Box for student input]
---
**Convection**
The exterior walls of a house have a total area of 190 \(\text{m}^2\) and are at 12.3°C and the surrounding air is at 6.4°C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 3.1 W/(m\(^2\)·°C). Since you’re looking for the rate of cooling, your answer should be entered as positive.
- [Box for student input]
---
**Conduction**
Ice of mass 14.6 kg at 0°C is placed in an ice chest. The ice chest has 2 cm thick walls of thermal conductivity 0.02 W/m·K and a surface area of 1.3 m\(^2\). Express your answers with appropriate mks units.
(a) How much heat must be absorbed by the ice during the melting process?
- [Box for student input]
(b) If the outer surface of the ice chest is at 27°C, how long will it take for the ice to melt?
- [Box for student input]](https://content.bartleby.com/qna-images/question/19e27ffe-b1a8-4434-899b-3df5c63a14a0/47b959b3-7e7e-4ca8-999e-441b1556cf1c/zduqf49_processed.png)
Transcribed Image Text:**Content**
| Substance | Latent Heat (J/kg) |
|---------------|--------------------|
| Steam ↔ water | 2,260,000 |
| Ice ↔ water | 333,000 |
Answer the following questions dealing with methods of heat transfer.
---
**Radiation**
An orange orb has an emissivity of 0.405 and its surroundings are at 324°C. The orange orb is absorbing heat via radiation at a rate of 640 W and it is emitting heat via radiation at a rate of 84 W. Determine the surface area of the orb, the temperature of the orb, & \( P_{\text{net}} \).
- \( A = .219 \, \text{m}^2 \)
- \( T_{\text{orb}} = 870.43 \, \text{K} \)
Your answer is correct.
- \( P_{\text{net}} = \) [Box for student input]
---
**Convection**
The exterior walls of a house have a total area of 190 \(\text{m}^2\) and are at 12.3°C and the surrounding air is at 6.4°C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 3.1 W/(m\(^2\)·°C). Since you’re looking for the rate of cooling, your answer should be entered as positive.
- [Box for student input]
---
**Conduction**
Ice of mass 14.6 kg at 0°C is placed in an ice chest. The ice chest has 2 cm thick walls of thermal conductivity 0.02 W/m·K and a surface area of 1.3 m\(^2\). Express your answers with appropriate mks units.
(a) How much heat must be absorbed by the ice during the melting process?
- [Box for student input]
(b) If the outer surface of the ice chest is at 27°C, how long will it take for the ice to melt?
- [Box for student input]
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