
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Use 1st law ,make it simple.

Transcribed Image Text:5-120 Consider a 20-L evacuated rigid bottle that is surrounded by the
atmosphere at 100 kPa and 27°C. A valve at the neck of the bottle is now
opened and the atmospheric air is allowed to flow into the bottle. The air
trapped in the bottle eventually reaches thermal equilibrium with the
atmosphere as a result of heat transfer through the wall of the bottle. The
valve remains open during the process so that the trapped air also reaches
mechanical equilibrium with the atmosphere. Determine the net heat transf
through the wall of the bottle during this filling process. Answer: 2.0 kJ
Air
20 L
evacuated
FIGURE P5-120
100 kPa
27°C
The tor
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