E103 2009 MT

E103 2009 MT - UNIVERSITY OF CALIFORNIA DAVIS MECHANICAL...

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UNIVERSITY OF CALIFORNIA, DAVIS MECHANICAL & AERONAUTICAL ENGINEERING ENG-103: FLUID MECHANICS MIDTERM Professor Aldredge 2009 Summer Session II 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 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. I HAVE READ AND UNDERSTAND THESE EXAMINATION RULES. Printed Name: _________________________________ Signature: _________________________________ Student ID: _________________________________
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1. What is the direction of the buoyancy force on a person in a standard air environment on earth? Explain why don’t people float in air? (5 points). The buoyancy force is upward. The reason that a person in a standard air environment on earth doesn’t float is that the upward buoyancy force (equal to the weight of air displaced by the person’s body volume) is less than the weight of the person.
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E103 2009 MT - UNIVERSITY OF CALIFORNIA DAVIS MECHANICAL...

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