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# Answers_T1_S09 - PHY107 SPRING 2009 EXAM 1 February 6 6-8...

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1 PHY107 SPRING 2009 EXAM 1 February 6, 6-8 p.m. Circle your instructor’s name : Prof. Ia Iashvili Prof. Gottfried Strasser Prof. Athos Petrou PRINT YOUR NAME LAST NAME _______________________ FIRST NAME_______________________ SIGN YOUR NAME _________________________________ STUDENT ID NUMBER ___________________________________ INSTRUCTIONS This is a closed book exam except that you are allowed one 8.5”x11” sheet with whatever you wish to write on it. There are 4 problems – you must attempt them all. Allow approximately 20 minutes for each problem. You must show ALL your work to receive full credit. Numerical answers must have the right units and the appropriate number of significant figures. Use the back of the problem page if you need more space and mark OVER on the front side to indicate that there is material at the back side. Enter your answers in the box at the bottom of each page. PROBLEM NUMBER MAXIMUM SCORE YOUR SCORE GRADER 1 25 2 25 3 25 4 25 TOTAL 100

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2 P1. A drunken sailor starts from point O and walks as follows: 1) 4.0 paces North, 2) 7.1 paces Northeast, and 3) 8.0 paces West. Each pace is 1.0 m long. a. (2) Determine the vector 1 r G that describes the first part of the walk (4.0 paces North). Use unit vector notation. b. (3) Determine the vector 2 r G that describes the second part of the walk (7.1 paces Northeast). Use unit vector notation.
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