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WMU PHYS 1150 - Final Exam

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PHYS-115(3) (Kaldon-16406) Name ______________________________________WMU - Winter 2001Final Exam - 100,000 points Check-Out: Q X T WS ___Section: 3a 3b 3c 3d A to F G to M N to S T to Z 04/16/2001•Rev.6State Any Assumptions You Need To Make -- Show All Work -- Circle Any Final AnswersUse Your Time Wisely - Work on What You Can - Be Sure to Write Down EquationsBOLDFACE Variables Are Vectors - Feel Free to Ask Any QuestionsIt’s Game Show Physics Time! Jeopardy? Family Feud? No… it’s… (50,000 points)1.) Two charges, q1 = q2 = +0.500 C, are located at y = +2.00 m and x = +2.00 mrespectively. (a) Find the net Electric field, rE , at the origin ( x = y = 0 ).(b) Find the magnitude of the force of q1 on q2.(c) Consider a solid hunk of metal that is very irregularly shaped. A charge +Q = 5.00 C is placed on the metal.Use Gauss’ Law to find the magnitude of the electric field, E, on a Gaussiansphere of r = R, as shown.(d) Use Gauss’ Law to find the magnitude of the electric field, E, of the hunk of metal at a point r = 100 R fromthe center.(e) How do you make a charge of +Q = 5.00 C on a hunk of metal?Physics 115 / Final Exam Winter 2001 Page 2Who Wants to Win a Million Dollars? (50,000 points)2.) All of the resistors in the circuit shown are R = 100. W. Considerthe three resistors along the right hand side (R2 , R5 , R7 ) which, for therecord, are not in parallel with each other. (a) Which of the threeresistors sees the largest current? Why?(b) Which of these three resistors generates the most heat? Why?(c) Find the equivalent resistance of this circuit. Note: you don’t have to do part (c) first to answer (a) or (b).If you want more room, use the back of page 7.(d) A parallel plate capacitor consists of plates that are 0.100 m × 0.275 m, separated by 0.0350m. If thiscapacitor is charged up with a 12.0 V car battery,what is the charge on the plates, ±Q ?(e) An electron is shot in between the plates as shown, moving to the left. Find the magnitude of the electricforce, FE, and tell whether the electron is accelerated Left, Right, Up, Down, Front or Back.This Michigan geek won $2,180,000 last week.Yeah, you can win big, too, if you have no life.Have a great summer, everyone!– Dr. PhilPhysics 115 / Final Exam Winter 2001 Page 3“The Tribe Has Spoken” (50,000 points)3.) (a) A light ray in the air comes down the perpendicular at thebottom of the five-sided glass prism (n = 1.53). The reflection anglesare approximately as follows: 1. 43° 2. 47° 3. 52° 4. 65°. Which ofthose four surfaces requires a silver mirror on the surface to force thereflection (circle them) and which don’t need to be silvered (X them)?(b) There’s something wrong with the drawing at 5. Correctlydescribe the problem for 5000 pts. Show the correct direction of theray for 8000 pts. Or calculate the correct angle in air for 10,000 points.If you assume that the lower right corner of the prism is a right-angle,you have enough information to solve the puzzle, Pat.(c) Two 1.25 m long segments of wire cross over each other as shown, separatedby a distance d = 0.0250 m (about an inch). If i1 = 1.25 A and i2 = 2.50 A, thenfind the magnitude of the magnetic force of wire 1 on wire 2.(d) A thin film of oil (n = 1.47) is sitting on water (n = 1.33), above the oil is air. If the thin film is a “half-wave” thickness, then if you were directly above the surface looking down (q = 0°), then do you see glare or noreflection?(e) A microwave has a wavelength l = 20.0 cm = 0.200 m. Find the frequencyf of this wave.Amber uses sling shot to try to win the ImmunityChallenge. Didn’t work. She got voted off.Physics 115 / Final Exam Winter 2001 Page 4“You Are The Weakest Link – Goodbye.” (50,000 points)4.) (a) Most calculators work display ten digits. If your calculator does so, then g = 1.000 000 001 is thesmallest gamma you can use to make any sort of a relativistic calculation. Solve the g equation for b, and findthe speed v that g = 1.000 000 001 corresponds to.(b) If g = 1.000 000 001, and the proper length Lp = one meter exactly then the Lorenz length contraction of theimproper length would result in a change of length on the order of: a football field, a meter stick, the width ofthis dot • , the width of an atom or the width of the nucleus of an atom. Pick one and defend your answer.(c) An electron in the helium ion He+ jumps from the n = 2 orbit to the n = 3 orbit. Find the radius of the neworbit and indicate whether a photon of light was ABSORBED or EMITTED by the electron to make the jump.(d) Given the information from the Periodic Table shown here, what isotope of chromium is likelyto be the most common? Write the isotope’s complete symbol down, then indicate how manyelectrons, protons and neutrons that an atom of that isotope should have.(e) The kinetic energy of a hydrogenic electron is KEZnE=+220 , where E0 = 2.18 × 10 -18 J. For whatelement, with what Z, is the innermost electron ( n = 1 ) have a KE that is just relativistic? (Use KE = ½mv².)Host Anne Robinson – the rudest The smash U.K. game show hit Thepersonality on TV, U.S. or U.K. Weakest Link is on againtonight on


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