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sample_midterm_(2006)

sample_midterm_(2006) - UNIVERSITY OF CALIFORNIA DAVIS...

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UNIVERSITY OF CALIFORNIA, DAVIS MECHANICAL & AERONAUTICAL ENGINEERING ENG-105: THERMODYNAMICS MIDTERM (69% AVERAGE) Professor Aldredge Summer Session II, 2006 YOU HAVE 1 HOUR AND 40 MINUTES TO COMPLETE THIS EXAMINATION. PLEASE SHOW ALL OF YOUR WORK ON THE PAGES PROVIDED, IF POSSIBLE. NOTE THAT THE PROBLEMS ARE NOT EQUALLY WEIGHTED. YOU ARE ALLOWED TO REFER TO YOUR OWN SHEET OF HANDWRITTEN NOTES DURING THE EXAM. YOU ARE ALSO ALLOWED TO REFER TO EITHER YOUR PROPERTY-TABLES BOOKLET OR TO THE CONVERSION FACTORS IN THE INSIDE FRONT COVER OF YOUR TEXTBOOK AND THE APPENDICES AT THE BACK OF YOUR TEXTBOOK. YOU MAY NOT REFER TO ANY OTHER PART OF YOUR TEXTBOOK OR TO ANY OTHER NOTES DURING THE EXAM.
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1. A student accidentally leaves the door to his refrigerator open when leaving his dormitory room. When he returns will he find that the room is hotter or colder than it was before he left? Neglect any heat transfer between the room and the environment outside of the room. You must fully justify your answer to receive any credit. (10 points)
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