Physics Lessons - 3009 Words

University of the Philippines College of Science PHYSICS 72 SET A Second Semester 2010-2011 First Long Examination National Institute of Physics 2nd Sem AY 2010-2011 Physics 72 INSTRUCTIONS: Choose the best answer and shade the corresponding circle on your answer sheet. To change your answer, cross-out and sign your original answer and then shade your new answer. No computational devices allowed (e.g. calculators, mobile phones). Following instructions is part of the exam. Useful formulas: Area Sphere (radius = r) Cylinder (radius =r, height = h) 1. Volume Useful constants: e me ÃŽ µo k -1.60 x 10-19 C 9.1 x 10-31 kg 8.854 x 10-12 C2/Nm2 8.988 x 109 Nm2/C2 Consider three identical metal spheres, A, B, and C. Sphere A†¦show more content†¦Electric fields passing through a Gaussian box (pointed inward) as shown in the figure to the right. Which of the following is a possible charge system inside the box? A. +4e and -3e B. 3e, -4e and +2e C. 16e, -23e and +7e D. +13e, -34e and +20e E. Cannot be determined 12. Find my charge. Two parallel infinite line of charge are separated by a distance 2L. A point P is located at exactly midway between the two lines of charge as shown in the figure. The charge density of line of charge 1 is +3ÃŽ ». What should by the charge density of charge 2 if the net electric field at point P is given by A. +3ÃŽ » B. -3ÃŽ » C. +(3/2)ÃŽ » D. –(3/2)ÃŽ » E. 0ÃŽ » â‚ ¬ ï  ¶ E = 0? 3|A 13. Rank the E-field. Consider a solid with a total charge Q and radius figure. Rank the points W, X, Y and magnitude of electric field. Point Y the conductor. A. Y=X=WZ B. ZY=X=W C. ZYX=W D. W=XYZ E. YZX=W conducting sphere R as shown in the Z according to the is on the surface of 14. Concentric. Consider two concentric metal spheres. Spheres 1 and 2 are both hollow as shown in the figure. A negative point charge (-e) is located at the center of the two spheres. Initially, spheres 1 (S1) and 2 (S2) have charges +2e and –e respectively. At static equilibrium, what is the charge at the outer surface of sphere 2? A. –e B. +e C. -2e D. +2e E. zero 15. Applications of Gauss’s Law. A point charge –Q and an infinite line of charge with linear charge density +ÃŽ » are situated a distance 2L from each other. What isShow MoreRelatedLesson Plan in Physics (Logic Gates)2757 Words   |  12 PagesLESSON PLAN I. Objectives At the end of the lesson, 80% should be able to: A. Differentiate the three basic logic gates B. Construct truth tables for each kind of logic gates C. Develop cooperation during class discussion II. Subject Matter A. Unit: Electricity and Magnetism B. Topic: Electronic Logic Circuits C. Concepts 1. AND gate works like a series circuit. 2. OR gate works like a parallel circuit. 3. NOT gate produces output opposite the input. D. Materials 1. Improvised logic gates (AND,Read MoreThe Study Of Physics Of Preschool Classrooms : Pedagogy And Lesson Planning1603 Words   |  7 Pagesstudy of Physics of Preschool Classrooms: Pedagogy and Lesson Planning† writing by, Matthew Schultz he shows how interesting and integrating it would be to teach preschoolers physics. I found this to be a very unique idea and concept of teaching young people. As stated by Schultz, â€Å"Keep in mind that preschool-aged children think that their teachers are simply an aspect of the classroom, existing only for that role, rising and setting just for them†(Schultz). With teaching preschooler’s physics, it willRead MoreThe Infinite Stupidity of Humans and the Universe Essay2754 Words   |  12 Pagesa complex one, because of the kind of research that is involved. The research will describe the career of astrophysics, what is required to become a successful astrophysicists and the impact this career has on society. 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