P140_E2_F04-2 - Physics 140 Fall 2004 Exam#2 Please print...

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Unformatted text preview: Physics 140 Fall 2004: Exam #2 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 two 3”x5” note cards with notes and equations you think may be useful. You can write on both sides of the cards if you like. 5. You will be asked to show your University student ID card when you turn in your exam. 1: A neutron (m n = 1 AMU) collides head-on with a deuteron (m d = 2 AMU). Predict the neutron recoil velocity if the initial velocity is v i in the positive x-direction and the collision between the two is totally elastic. a)-2/3v i b)-1/3v i c) 0 d) 1/3v i e) 2/3v i 2: A person enters a building through a revolving door. Initially the door is at rest. The person pushes on the door with a constant tangential force F at a distance D from the axis of the door. If the moment of inertia of the door is I, the time taken for the person to enter through the revolving door is: a) (2 π ID/F) 1/2 b) (2 π F/DI) 1/2 c) (2 π I/FD) 1/2 d) (2 π FD/I) 1/2 e) (2 π D/FI) 1/2 F D 3: The 1996 film Eraser introduces a fictional weapon called a "rail gun", which fires pellets at *extremely* high speeds. According to the dialogue, they move at "nearly the speed of light". In a dramatic scene near the climax of the film, Arnold Schwarzenegger is shown holding one of these guns in each hand, firing streams of high-speed bullets at his enemies. If we assume Arnold has a mass of 150 kg (holding the two guns), and that he fires a single bullet of mass 1 gram at 2.7x10 8 m/s (90% the speed of light), how fast would he be thrown backwards? [Note: anything moving this close to the speed of light would exhibit extra effects that are described by Einstein's theory of relativity. Ignore these effects for this problem. They would make the recoil speed higher.] Remember 1 m/s = 2.24 mph....
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This note was uploaded on 04/03/2008 for the course PHYSICS 140 taught by Professor Evrard during the Fall '07 term at University of Michigan.

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P140_E2_F04-2 - Physics 140 Fall 2004 Exam#2 Please print...

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