Solutions_T1_108_F2010

Solutions_T1_108_F2010 - PHY108 Fall 2010 EXAM 1 October 2,...

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1 PHY108 Fall 2010 EXAM 1 October 2, 9:00 – 11 a.m. Circle your instructor’s name : Prof. Ia Iashvili ( 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 ε o = 8.85 × 10 -12 C 2 /N.m 2 k = 8.99 × 10 9 N.m 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 TOTAL 100
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2 P1. Two identical conducting spheres carry a net charge 5 9.00 10 C Q . The two spheres carry positive charges 1 q and 2 q as shown in fig.a. Their centers are placed at a distance r = 1.16 m. The force F each one exerts on the other is repulsive and has magnitude equal to 12.0 N. a. (10) Calculate the charges 1 q and 2 q . The solutions of the equation: 2 0 ax bx c ++ = are: 2 4 2 bb a c x a −± = The two spheres are now brought into contact (see fig.b) and then are placed back in their old position (see fig.c).
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This document was uploaded on 11/04/2011 for the course PHY 108 at SUNY Buffalo.

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Solutions_T1_108_F2010 - PHY108 Fall 2010 EXAM 1 October 2,...

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