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Exam 2 Fall 2005 Solutions

Exam 2 Fall 2005 Solutions - KLI/A*rswEtS PHYSICS221 FALL...

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KLI /A*rswEtS PHYSICS 221 FALL 2OO5 EXAM II Name (printed): lD Number: Section Number: Recitation Instruction: INSTRUCTIONS: Put away all materials except for pens, pencils, erasers and your calculator. This l2O-minute exam contains 30 equally weighted multiple choice problems worth a total of 85 points (75 points + 10 extra credit points). In marking the multiple choice bubblesheet usea number 2 pencil. Do NOT use Ink. If you did not bring a pencil, ask for one. Fill in the appropriate circlescompletely. If you needto change any entry, you must completely erase your previous entry. Also. circle your answers on this exam. Carefully ready each problem and its five possible answers before beginning to work the problem. Select one and only one answer for each problem. Choose the answer that is closest to the correct one. v. Please turn over or cover your bubble sheet when you are not marking it. vi. Before handing in your exam, be sure that your answers on your bubble sheet are what you intend them to be. If you want to, copy down your answers on a piece of unused scratch paper for comparison with the answer key to be posted later. vii. When you are finished with the exam, place all exam materials, including the bubble sheet, the exam itself, and scratch paperthat you usedfor the exam, in your folder and return the folder to vour recitation instructor. viii. No cell phone calls allowed. Either turn off your cell phone or leave it at home. Anyone taking cell phone calls must leavethe testingroom and will not be allowed to return. ll. lll. lv. GOOD LUCK
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3 I . A 100-9 ball traveling at 20 m/s horizontally to the left is hit by a racket. The ball and the racket are in contact for 0.2 ms. As a result of the blow, the ball leaves the racket traveling to the right at anangle of 45 degrees with the horizontal, at20 m/s. What is the magnitude of the average force exerted by the racket on the ball? A . 0 B. 7.7 x 103 N ,/-a., acj 1.8 x lo4 N D 2 . 0 x l 0 a N E. 2.5 x l}a N 32. A 20-kg child stands on a 10-kg wagon that rolls at2.0 m/s to the right. The child jumps to the left, at 1.0 m/s relative to the ground. Compare the change in momentum of the child and the change in momentum of the wagon. A. AF"n'o = -4LF*^ron B. Ap"n,,o = -2LF*uron l r \9 AF"n,,o : -Ll*uron D. AF.n,,o : &*ugon E. AF"n,,o = 2LF*unon
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