p140_exam_1_1_answers - Physics 140 Winter 2006: Exam #1...

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Physics 140 Winter 2006: Exam #1 Please print your name:___________________________________________________ Please list your discussion section number:___________________________________ Please list your discussion instructor:________________________________________ Form #1 Instructions 1. Fill in your name above 2. This will be a 1.5 hour, closed book exam. The exam includes 20 questions. 3. You may use a calculator, please do not share calculators 4. You may use one 3”x5” note card with notes and equations you think may be useful. You can write on both sides of the card if you like. 5. You will be asked to show your University student ID card when you turn in your exam. Discussion section reminder: Section 004 Svetlana Malinovskaia Section 005 Svetlana Malinovskaia Section 006 Svetlana Malinovskaia Section 007 Ctirad Uher Section 008 Ctirad Uher Section 009 Ctirad Uher Section 010 Fred Becchetti Section 011 Fred Becchetti Section 012 Fred Becchetti Section 013 Alan Krisch Section 014 Alan Krisch Section 015 Alan Krisch Section 016 Svetlana Malinovskaia Section 017 Svetlana Malinovskaia Section 018 Svetlana Malinovskaia Section 019 Konstantin Bobkov Section 020 Arthur Cole Section 021 Konstantin Bobkov Section 022 Dave Winn Section 023 Dave Winn Section 024 Dave Winn Section 025 Arthur Cole Section 026 Arthur Cole
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1: A motorcycle travels due south 25 m/s relative to the highway. An SUV travels at the same speed relative to the highway, but at a heading of 30 degrees south of east. What is the speed of the SUV relative to the motorcycle? a) 37.5 m/s b) 12.5 m/s c) 3.3 m/s d) * 25 m/s e) 46.6 m/s 2: According to statistics compiled by zoo psychologists, suicidal elephants have a much larger terminal velocity than suicidal mice. Which of the following statements best explains this phenomenon? a) The air drag force acting on elephants is smaller than the air drag force acting on mice. b) Mice weigh less than elephants so gravity does not accelerate them downward as rapidly as it does for elephants. c) * Mice have a much larger surface area to mass ratio than elephants, so air drag has a relatively larger effect on them. d) Elephants fall faster because they are afraid of mice. e) The air drag force acting on elephants is much larger than the air drag force acting on mice due to the larger surface area of elephants. Thus, the zoo psychologists must have made a mistake in their measurements of terminal velocity. V SUV,Mot = V SUV – V mot These three vectors form an equilateral triangle, so the speed of the suv relative to the motorcycle must also be 25 m/s. F = 1 / 2 CAρv 2 mg= 0 This can be solved for terminal velocity. Note that it depends upon the ratio of mass/area. Also note that the other answer choices can mostly be ruled out. .. a) The air drag force on elephants must be larger because elephants are much bigger. b) gravity accelerates all objects equally. d) this is just silly. e) This is tricky, refer to above equation.
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3: The coefficients of friction between the incline and the block are as follows: μs = 0.8, μk =0.74 Which of the following statements about this situation is true?
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p140_exam_1_1_answers - Physics 140 Winter 2006: Exam #1...

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