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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 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, & Pnet.

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, & Pnet.

Principles of Physics: A Calculus-Based Text
Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter16: Temperature And The Kinetic Theory Of Gases
Section: Chapter Questions
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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 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, & Pnet.

Content Substance Steam water Ice → water 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, & Pet A = 219 m^2 Torb = 870.43 K Pnet = Latent Heat (J/kg) 2,260,000 333,000 F Convection Conduction Y Your answer is correct. The exterior walls of a house have total area of 190 m² 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/(m².°C). Since you're looking for the rate of cooling, your answer should be entered as positive. 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 m². Express your answers with appropriate mks units. (a) How much heat must be absorbed by the ice during the melting process? (b) If the outer surface of the ice chest is at 27° C, how long will take for the ice to melt?
Transcribed Image Text:Content Substance Steam water Ice → water 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, & Pet A = 219 m^2 Torb = 870.43 K Pnet = Latent Heat (J/kg) 2,260,000 333,000 F Convection Conduction Y Your answer is correct. The exterior walls of a house have total area of 190 m² 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/(m².°C). Since you're looking for the rate of cooling, your answer should be entered as positive. 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 m². Express your answers with appropriate mks units. (a) How much heat must be absorbed by the ice during the melting process? (b) If the outer surface of the ice chest is at 27° C, how long will take for the ice to melt?
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