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T1_108_solutions_2011

# T1_108_solutions_2011 - PHY108 Fall 2011 EXAM 1 October 1...

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1 PHY108 Fall 2011 EXAM 1 October 1, 8:00 10 a.m. Circle your instructor’s name : Prof. Avto Kharchilva ( T,Th 12:30-1:45 pm) Prof. Athos Petrou ( M,W,F 2:00-2:50 pm) PRINT YOUR NAME LAST NAME FIRST NAME SIGN YOUR NAME STUDENT ID NUMBER Useful Constants o = 8.85 10 -12 C 2 /N.m 2 k = 8.99 10 9 kg.m 3 .s -2 .C -2 e = 1.60 10 -19 C m p = 1.67 10 -27 kg m n = 1.67 10 -27 kg m e = 9.11 10 -31 kg N A = 6.02 10 23 atoms/mol g = 9.80 m/s 2 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 correct SI 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

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2 P1. Three charged particles are placed at the corners of an equilateral triangle of side 1.20 a m, as shown in the figure. The charges are: 1 7.00 C q , 2 8.00 C q   , and 3 6.00 C q   . Calculate the following: a. (4) The magnitude 12 F of the force 12 F exerted on 1 q by 2 q . Draw 12 F on the figure. b. (4) The magnitude 13 F of the force 13 F exerted on 1 q by 3 q . Draw 13 F on the figure. c. (5) The x -component 1 x F of the net force 1 F exerted on 1 q by 2 q and 3 q . d. (5) The y -component 1 y F of the net force 1 F exerted on 1 q by 2 q and 3 q . e. (4) The magnitude 1 F of the net force 1 F . f. (3) The angle between 1 F and the x -axis 6 6 1 2 12 2 2 12 0 6 6 1 3 13 2 2 12 0 2 1 12 13 1 12 7 10 8 10 a. 0.350 N 4 4 3.14 8.85 10 1.2 7 10 6 10 b. 0.262 N 4 4 3.14 8.85 10 1.2 c. cos60 cos60 0.35 0.5 0.262 0.5 4.20 10 N d. sin6 x y q q F a q q F a F F F F F  
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T1_108_solutions_2011 - PHY108 Fall 2011 EXAM 1 October 1...

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