PH222-Su10-Exam3-SolutionRD

PH222-Su10-Exam3-SolutionRD - Physics 222, Summer 2010 EXAM...

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Unformatted text preview: Physics 222, Summer 2010 EXAM # 3 Monday, July 26,2010 Name (Printed): 6:7 /t-{ [4,. Section Number: Recitation Instructor: INSTRUCTIONS: 1. This is a one and one half ( 1 72) hour exam consisting of 25 multiple-choice questions. Each question is worth 1 point. I will count your best correct answers for a total of up to 25 points. Use your previous bubble sheets answering questions # 51 through it 75 2. Use a number 2 pencil when marking your bubble sheet. Do not use ink. Ask for a pencil if you did not bring one. Fill in the appropriate bubble completely. If you need to change any entry, you must completely erase your previous entry. Also, circle your answer on the exam. 3. Carefully read each problem and its five possible answers before beginning to work on the problem. Select only one answer for each problem. Choose the answer that is closest to the correct one. 4. Before handing in your exam, be sure that your answers on your bubble sheet are what you intend them to be. You should copy down your answers on a piece of a scratch paper for comparison with the answer key to be posted later. 5. When you are finished with the exam, place all exams materials, including the bubble sheet, the exam itself, and scratch paper that you used for the exam, in your folder and return the folder. Good Luck! -- Art Meyers 51. if yes; have a solenoid in series with a shunt resistance of 50 f} with the AC voltmeter across the shunt reading 2.5 votts. This soienoid has 70 turns in 10 cm in each of S iayers. The soienoid has a diameter of 4 cm. What is the Brms field in the solenoid (in Tesla]? A 2.20><1t)'5 2.20 x 10“ 5 {7,3 be {Ia/L) C} 1.55 x 10" D 300 x 10““ E} 11.0 x 10" 52. if a coil of 200 turns with a diameter of 2.5& cm is placed inside the above Solenoid (assume 8m}, = 8 x 10" T) what will be the Em,S voitage read in an AC voltmeter or a digital scope {in voits} if the frequency = 2000 Hz? A} 78.98 B} 7.90 , I. _ Pg. Cl 1.55 See. 1’56 ff? w’ D 1.40 0.987 53. The speed of waves in a vacuum is given by A] HOEU 3] \KEIaE: r-c—v @ life’flc-Ec 0} Ulises _ Ei l-I’UQEGY 54. Reiates net magnetic flux to net {total} enclosed magnetic charge A] Ampere—Maxwell Law 3] Faradav’s Law (I) Gauss’ Law for Electricity Ga uss’ Law for Magnetism _ M {3 none of these ‘ ' 55. Reiates net eiectréc flux to enclosed electric charge A} Ampere—Maxwell Law 8 Faradav’s Lew Gauss’ Law for Etectricity Di Gauss’ Law for Magnetism . E} norm of these . 4' 86. Relatesinduced electricity field to changing magnetic flux " A Ampere~Maxweii Law {ET Faraday/5 Lew C] Gauss’ Law for Electricity Di Gauss' Law for Magnetism E} acme of these 57. 59. 60. 61. Reiates induced magnetic field to changing electric flux but not to current r—_.__._..--— A) Ampere-Maxwefi Law B] Fa raday’s Law C) Ga uss’ Law for Electricity D Gauss’ Law for Magnetism none of these Consider an oscillating LC circuit with L 2 J0 m H and C = 4.0 uF, the current is initéaily a maximum. How long before the capacitor is charged for the first time? . r” a ____ u N? ,...,.:,? .1 ,3- ",NLIW. (bf/{gytli ’Ir 7 (MAX? ; < z? 92(- A} 1.96 x 10' sec c; . i B} 1.4 x 101.3 sec M"; " .. W I? " 9 K C 4.90): 10‘7 sec 3/ 2??? m: W 2'5"“; '2'; 9- =-’Xfflf3§ 7.0 x 10"1 sec " “r ----- egg-H J m .......... .. 4 E) none of these. . “cf. LC osciElators are used in circuits connected to ioud speakers to create electroriic muséc. What inductance must be used with a 6.7‘uF capacitor to produce frequency of 10 kHz? — f {A W. iv» a gap? _ q . W": V I,” L L; A] k B} 3.8 x 10' H _ I C} 5.05 x 10'5 H ' : m‘f ,,,,,,,,, :- _ ............................................. 3w“. ........................... M 3; .9 (i 2. . 9 . L! .2— . {F .. eosme H 92,-; 76 C [film-am- 1/3; (g )7 A» 3*} none of these & An LC series; circuit with an inductance L and a capacitance C has an osciliation frequency 1‘. Two ind UCtOFS each with the original inductance L and two capacitors each with the originai capacitance C are Egal! wired in series and the circuit is compieted with the osciliator. The osciliation frequeecy in this second circuit wiil, compared to the original frequeacv t, have the value. in“ 6 H, g «e i g, (offing-g '2? ’2. - [L If Z J z _ A", .. (V: 1:: _, - M. ' ' A] U4 6 (hr. c- a. f” g” g j I Bi W J in 3:: a Z” r“ ’ Z) (W @ f ,«PM ........... u 6‘ on 2f Home“ LN m I‘WC"? a; E‘ 4f .c:;:.-— H ’ (f m m»“’”"’“ m ' ’ ' ’ 7’4 i "“’ WWWL , r. What isthe Equivaient Inductance forthe foIIOwing circuit? [in Henries} {M m A} 7.63 B} 12.43 C} 22.5 x 40.6 none of the above é {55° X70}? 2.- (ff. i 62. 63. 6‘1. 65. 65. What direct current will produce the same amount of thermal energy, in a particular resistance, as an alternating Current that has a maximum value of 7.80 A (answegin amps) A} I; lfz K _'.' 593V€M f; flyg/‘ijtfzéfiiéé" a 3.90 em" - rW " . < 3 if if @ 5.52 . r7 : aka/7 ,; Miran” £0. we.th f i {2‘ o; 7.80 -- , j: M 1&2”? m ,. a] 11.03 _________ _ fig? (0; 7g " “ 5‘53"? What is the radiation force on a gmllxmreflgmcgiflg sailjgt a distance 3.0 x 10ll m from the sen {solar power 2 3.9 x 10“ W] if the sail is square with an edge length of 3.0m and with the surface i to direction of sunlight (in Newtons)? 2e _ . M i9 set/’9 W ., ga/(M/m’“ A} 1.15 x 10"" “z; '17 .... “Q: :1 r B) 4,6 x 10'5 of; r t {i 52 X if) X4» c 9.2 x 19'3 ,. n h f _ ® x 10-5 A “3" {5‘9- p-l . l f 1) 5);“ )2 n H I? 1 In J; 3;! E} none of these I} 232“- ....................... M ‘1' 1-. 1X ’ ‘ " 17 ,fi if} A _/L>}' fifo'e/j Light of uniform intensity shines perpendicular on a totally reflecting surface, fully illuminating the surface. if the area of the surface is decreased: A] The radiation pressure increases and the radiation force increases. 8} The radiation pressme increases and the radiation force decreases. . The radiation pressure stays the same and the radiation force increases. The radiation pressure stays the same and the radiation force decreases. E The radiation pressure decreases and the radiation force decreases. it you put a point source of fight S at a distance d in from of screen A. How is the tight intensity at the center of the screen changed if you put a completer reflecting mirror M at a distance 2 d behind the source (Ratio of New Intensity to Original Intensity}. See figure: A} 25! 26 Mirror _ M Screen A - B} 6/5 ,5. c sis . ‘3' ® 26(25 3 E} none of these a?" {Jig/Jay} =‘_.... 2d__ ............. +1 4 ....... ..d ...... ..,. The figure shows the passage of a ray of tight from substance X into air. The index of refraction of X is: A) ego a} 0.98 C} 1.03 @ 1.25 -i 1.68 .n. G7, 68. 69. 70. About how far apart must you hoid your hands for them to be separated by 4.0 nano-light- seconds? (in cm} - closest value A} 90 if“ 3’4"} (“m /%5 B 200 ,g_ ., _ 74., a" g I x ' 52564;” @ 125 6,257: r__ f; - (“/6 ;/.w//i~)(//.-.)£,) ) J 150 E) 200 A person with a height of 200 cm wants to see their entire height in a fttli mirror mounted on the wall. What is the ieast height the mirror must have? (in cm} Assume: Venice; tength of mirror = height A) 50 * @ 100 3159:". i? (12/ } 150 D} 200 E) not enough informatioe given For a certain series RLC Circuit, the maximum generator EMF is 125 V and the maximum current is 3.20 A. If the current leads the generator EMF by 0.982 rad, what is the impedance of the circuit? . i (f 52”“ 5/ , I. . . A) 21.70 27-“ ........ Mi? ":3 “we: r 371i at B] 22.10 29 fl C) 38.43 g 39.1 0 } not enough information given The figure shows four pairs of polarizing sheets. seen face-on. Each pair is mourned in the path of initially unpolarized iigiit, which iiiuminates the front polarizer and then through it to aiso illuminates the polarizer directly behind with polarized light. The incident intensity is the same on all f0ur pairs of pciarizing sheets. Rank the pairs according to intensity of'transmitted light through both polarizing sheets, from greatest to least: M, firm—rm 3f} ”’- n'vtdk‘i 71.. A real inductor and a 50 p. F capacitor are the eiements of a L-R-C circuit. The real inductor has an inductance of 80 mH and a resistance of 48 ohms. The Cis’cuit is in a state of undamped oscifiation. The angular frequency of the oscillation of the circuit is cioset to: {in radls) \ W my I I Z {3. A} 500 w i .3 W W.“ C g z D} :1:- _, _,.____,,__._‘m__..‘,-: ......... .W _._. _#77_:_,..,.,I it, {If/9;; r/Mfi» E; 300 Lfgwé 31i)(3‘"x!f"t') ems} Ar» 7") 72. in the figurer a ray ob, of natural iight in air, makes an angle of incidence {a at b of; a pies“: plate The reflected rev bc is incident onto a glass surface at c, is reflected again, and continues as my Cd. The index of refraction of the plastic is 1.48. The giass surface forms a 60° angle with the plastic surface. The angie of incidence B is set at 62“. Ray cd is 101“) percent polarized but ray be is not. The index of refraction of the glass is closest to: r. . A ,- a ,3 52x52?» arrea~ie-~w‘9"“’é’ A} 1.54 8 air 3) 1.53 oz: 3’2 " ‘\ ’ o C} (£30 x g); i' H 3’2 6' T. .i' D} 1.52 @ 1,60 21-81}: 11‘} .... “affix; 3.72:”? If * ._ iastic iffiafi’ p (Pi - .,~ -' {J _ I; “If; fi'i’m‘ .412? “A?” {g — . t/ 73. The critical angle for an air-glass interface iséOS degrees. A ray in air is incident on the interface. The reflected ray is 100 percent polarized. Yhe angie of refraction is dose? to: : 5:4 X” m if ” r . A} 9.130 fl?- " we " \4 6’3 % 5;) e} 8.530 W_ l W i f { 6, \fli ‘ f C} 9.73” *7 “3’2. “‘ “I; 3”” s" w 2’ ’2 nit-l .7 0 so, 5/, g _ __,. - Jo ...................................... .. o 7.98 if . .l 4 ti «. ,. ., . q‘" -~"' ’ " {19/3 -: tyfif. 7“ 59"" z 3' "(J/J M ‘75? N”? '7 g ' 74. A plane mirror is pieced on the levef bottom of a swimming pool which holds water (3)2133} to a depth of 2.5 m. A small toy is suspended 2.0 m above the mirror. An observer above the water looks verticafiy downward at the toy and its image in the mirror. The apparent differente in depth between the tov and its image in the mirror is closest to: 3/? 5} ‘2 . ' - 4'" :_——'-—-— “— {. {£41. A] 2.3m 5 :5 {‘33: B} 2.0m (3)1.7m {x wm/im. 3.0m i5 ‘1) E} 2.7m . . M Ala/XV?“ agrij’ky'f‘l’i'e " 1‘ .4 .a' 1:, .. ;. d ‘ 45.x”. é”) > mer w e51 w . w is «Wee {3'54 m arm -: 37/}; Hui ‘75. Suppose you wanted to start a fire using sunlight and a mirror. Which of the following statements is most accurate? It wouici be best to use a concave mirror, with the object to be ignited positioned heifan between the mirror and its center of curvature. B) it wouid be best to use a concave mirror, with the object to he ignited positioned at the center of curvature of the mirror. C} It wouid be best to use a plane mirror. D) It would be best to use a convex mirror. E) One cannot start a fire using a mirror, since mirrors form only virtuai images. 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This note was uploaded on 02/11/2012 for the course PHYSICS 222 taught by Professor Ogilvie during the Fall '05 term at Iowa State.

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PH222-Su10-Exam3-SolutionRD - Physics 222, Summer 2010 EXAM...

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