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ERIC Number: EJ1032880
Record Type: Journal
Publication Date: 2014-Feb
Pages: 2
Abstractor: As Provided
Reference Count: 2
ISSN: ISSN-0031-921X
Revisiting a Problem of Two Freezers
Easton, Don
Physics Teacher, v52 n2 p104-105 Feb 2014
The January 2013 Physics Challenge for Teachers and Students has some features that are surprising and worth a closer look. The problem concerns a Carnot-cycle refrigeration unit operating inside a tent. It achieves dynamic equilibrium with a freezer ("cold") compartment temperature of T[subscript C] = 13°C, tent temperature of T[subscript H] = 1°C (the "hot" waste side of the freezer), and temperature "outside" of the tent of T[subscript O] = 0°C. The problem is to find the equilibrium temperature inside the tent if an identical freezer is brought in and run simultaneously. As explained here, what constitutes an identical freezer is open to interpretation.
American Association of Physics Teachers. One Physics Ellipse, College Park, MD 20740. Tel: 301-209-3300; Fax: 301-209-0845; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A