College Prep Physics I Multiple Choice Practice Final #2 Solutions Northville High School Mr. Palmer, Physics Teacher. Name: Hour: Score: /zero

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1 Collg Pp Phsics Multipl Choic Pactic inal # Solutions Nothvill High School M. Palm, Phsics Tach Nam: Hou: Sco: /zo You inal Exam will hav 40 multipl choic qustions woth 5 points ach.. How is cunt actd i th tim intval ov which th chag passs though a givn aa dcass whil th amount o chag mains th sam? a. Th cunt incass. b. Th cunt dcass. c. Th cunt initiall incass and thn is gaduall stod. d. Th cunt is not actd. ΔQ Δt So i t is dcasd and Q mains th sam, thn cunt would hav to incas. Answ a. Two sistos having th sam sistanc valu a wid in paalll. How dos th quivalnt sistanc compa to th sistanc valu o a singl sisto? a. Th quivalnt sistanc is twic th valu o a singl sisto. b. Th quivalnt sistanc is th sam as a singl sisto. c. Th quivalnt sistanc is hal th valu o a singl sisto. d. Th quivalnt sistanc is gat than that o a singl sisto. R R R & R R paalll + R R + R R R Answ c. a vitual imag is omd 0.0 cm along th pincipal axis om a convx mio with a ocal lngth o magnitud 5.0 cm, what is th objct s distanc om th mio? a. 0.0 cm b..0 cm c cm d..00 cm Convx mios alwas hav a ngativ ocal lngth, -5.0 cm Vitual imag mans that th imag distanc is ngativ, q -0.0 cm + p q p p q q cm Answ a 4. A poton is tavlling ppndiculal to a magntic ild. it is tacing out a cicl with a adius o. cm & th magnitud o th magntic ild is 490 mt, what is th spd o th poton? a.. x 0 0 m/s b.. x 0 7 m/s c. 8.6 x 0 0 m/s d. 6. x 0 6 m/s Not: You should know that a & c can t b coct bcaus th a ast than th spd o lctomagntic wavs o.00 x 0 8 m/s and nothing can mov ast than that. (accoding to th known laws o phsics). This is an objct moving in a cicl and th onl oc in th BD is B B acting inwad. vt in B mac qvbsin m bcaus th angl btwn th vlocit and th magntic ild is 90. Answ d 9 v mv qb (.6 0 )( 0.490)( 0.0) m qvb sin 90 m qb v m.67 0 s θ von bought v to th pat! (v & v t a th sam) & θ 90º t 6 Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag o 0 m s

2 5. n th diagam shown abov, th imag o objct B would b a. al, ducd, and upight. b. vitual, nlagd, and upight. c. vitual, ducd, and invtd. d. vitual, ducd, and upight. Convx mios alwas poduc an imag that is vitual, upight & ducd. Sing song o s diagam. Ans d 6. What tp o imag dos a convging lns poduc? a. al b. vitual c. al o vitual d. non o th abov t can poduc a al o vitual imag; it just dpnds wh th objct is placd lativ to th ocal point. Answ c 7. A mass o 9.75 μg loats on Eath i it is placd in an E ild that is ointd downwad and has a magnitud o 550 N/C. What is th chag on this mass? a. -5. μc b. 550 nc c nc d. -.7 pc g kg 9 n ou Bod Diagam g is down and is up. m 9.75μ g kg 6 0 μg 000g mg g ma 0 g & E qe & g mg qe q q E 9 (.75 0 )( 9.8) 9 0 q.77 0 C. 7 pc 550 Answ d Not: Th chag must b ngativ in od to mak th up in an E ild that is ointd downwad. Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag o 0

3 8. An objct is placd 0.0 cm om a thin convging lns along th axis o th lns. a al imag oms bhind th lns at a distanc o 8.00 cm om th lns, what is th ocal lngth o th lns? a. 5.7 cm b..0 cm c.. cm d.. cm + p q + p q cm Answ a 9. Chag q and q a oiginall 5.0 m apat. How much wok dos it tak to mov chag q so that it is onl.m om q? q +.9 nc & q -5.4 pc. a. -. x 0-0 J b. +. x 0-0 J c. -. x 0-4 J d. +. x 0-4 J Th wok don h will b in th om o th chang in lctic potntial ng associatd with ths kqq two chags. Bcaus th a point chags, w will us PE l kq q kqq Δ W PE l PEl PEl i kqq i i W ( )(.9 0 )( ).6 0 J Answ a 5 Not: Th wok don is ngativ bcaus th chags will los lctic potntial ng as th mov clos togth. t s lik pushing an objct down though th ai towads th ath; th objct is alad acclating that wa. 0 Which o th ollowing dscibs what will happn to a light a incidnt on a glass-to-ai bounda at gat than th citical angl? a. total intnal lction c. patial lction, patial tansmission b. total xtnal tansmission d. patial lction, total tansmission At an angl o incidnc gat than th citical angl th light a would b actd mo than 90, which is impossibl bcaus it would not lav th incidnt matial. Tho th light is totall intnall lctd. Answ a. A cunt-caing wi 0.50 m long is positiond ppndicula to a uniom magntic ild. th cunt is 0.0 A East and th is a sultant oc o.0 N down on th wi du to th intaction o th cunt and ild, what is th magntic ild? a T South b. 5 T Noth c T Noth d. 5 T South B B LB sin θ B T Us Right Hand Rul to ind diction. Lsinθ ( 0)( 0.5) sin 90 ings point in th diction o th cunt o East, thumb points in th diction o th magntic oc o down and ings cul in th diction o th B ild which is South. Answ a Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag o 0

4 Th igu abov shows th pattn o a doubl-slit intnc xpimnt. Th cnt o th pattn is locatd at E. This igu is o poblms -5.. n th igu abov, o which o th ollowing ings is th path lngth o th light wav om on slit mo than on wavlngth gat than th path lngth o th light wav om th oth slit? a. A and B b. A, B, and C c. B and C d. B, C, D, and E Bcaus E is th cntal maximum, D & a hav light om on slit ½λ gat than om th oth slit, C & G a λ gat, B & H a.5λ gat, and A & a λ gat. Answ a. n th igu abov, which ing psnts a st-od minimum? a. A b. B c. C d. D Location D is th zo th od minimum, so B is a st od minimum. Answ b 4. n th doubl-slit intnc xpimnt that poducd th igu abov, th two slits a movd clos. Which o th ollowing would occu to th pattn shown in th igu? a. E would shit to th ight. b. E would shit to th lt. c. would shit to th ight. d. would shit to th lt. ( sin θ ) mλ d ; i d dcass thn sinθ must incas tho θ must incas. Tho all th bight and dak ings a going to mov awa om th cntal E. Answ c 5. n th doubl-slit intnc xpimnt that poducd th igu abov, th two slits a 40 μm apat, th wall was 4.5 m awa and D & a. cm apat. What wavlngth light was usd in this xpimnt? a. 690 nm b..6 μm c. 5 nm d. 5 μm D is th zo th od dak ing. So m 0 and th quation is d ( sinθ ) m + λ. n od to ind θ.cm O w nd to us tanθ θ tan ( 0.004) & d ( sinθ ) m + λ H 450cm d sin 6 ( θ ) ( 40 0 ) sin( ) λ m 69nm answ a m + 6. What happns whn a ubb od is ubbd with a pic o u, giving it a ngativ chag? a. Potons a movd om th od. b. Elctons a addd to th od. c. Elctons a addd to th u. d. Th u is lt nutal. Elctons a in th obital shlls o th atom. Potons a in th nuclus. Tho, th lctons lav th obital shlls & th potons sta tightl bound in th nuclus. Elctons hav a ngativ chag & th u has a ngativ chag. Tho lctons hav movd om th ubb od to th u. Answ c Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag 4 o 0

5 7. What is th path o an lcton moving paalll to a uniom magntic ild? a. staight lin b. cicl c. llips d. paabola ( 0 ) sin( 80 ) 0 B qvbsin θ qvbsin qvb No nt oc mans th lcton will mov in a staight lin. You could t to agu that th oc o gavit would pull it down, howv, th oc o gavit on an lcton is so small to b ngligibl and tho th path is a staight lin. Answ a 8. Two positiv chags, q +q & q +q, a on th -axis. q is at point +a and q is at point a. Wh would a thid positiv chag, q +q, b locatd o th nt oc on th thid chag to b zo? a. at +0.4a b. at +0.7a c. at 0.7a d. at 0.4a Th oc om chag on chag is down and has a magnitud, Th oc om chag on chag is up and has a magnitud, x ( q)( q) kq q k kq ma ( q)( q) kq q k 6kq 6kq kq 0 t would appa as though w onl hav on quation and two unknowns, howv, w know that: + a a & ( a ) + a ( + ). 44 a a.44 n oth wods, th thid chag nds to b 0.884a blow q o 0.76a abov o th oigin. Answ b 9. Whn a positiv chag movs in th diction o th lctic ild, what happns to th lctical potntial ng associatd with th chag? a. t incass. b. t dcass. c. t mains th sam. d. t shapl incass, and thn dcass. Th answ is asist to s using th quation, Δ PE l qeδd ; n th quation q, E & d a all positiv so th Elctic Potntial Eng will dcas. Wh did it go? t could hav bn convtd to Kintic Eng, in oth wods, th chag could b spding up. Answ b 0. Th diction o th oc on a cunt-caing wi in an xtnal magntic ild is a. ppndicula to th cunt onl. b. ppndicula to th magntic ild onl. c. ppndicula to both th cunt and th magntic ild. d. paalll to th cunt and to th magntic ild. Accoding to th Right Hand Rul, th thumb will point nomal to both th diction o th cunt and th B ild. Answ c.. a 75 W lightbulb opats at a voltag o 0 V, what is th cunt in th bulb? a. 0.6 A b..6 A c..95 x 0 A d. 9.0 x 0 A P 75 P ΔV 0. 65A ΔV 0 Answ a Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag 5 o 0

6 . A cicuit has a continuous path though which chag can low om a voltag souc to a dvic that uss lctical ng. What is th nam o this tp o cicuit? a. a shot cicuit b. a closd cicuit c. an opn cicuit d. a cicuit schmatic This is th dinition o a closd cicuit. Answ b. Th sistos connctd in sis ca cunts labld,, and, spctivl. Which o th ollowing xpsss th total cunt, t, in th sstm mad up o th th sistos in sis? a. t + + b. t c. + + t d. t + + Whn sistos a connctd in sis th anthopomophic chags must go though ach o th sistos, tho t. Answ b 4. A lashlight bulb with a potntial dinc o 4.5 V acoss it has a sistanc o 8.0 Ω. How much cunt is in th bulb ilamnt? a. 6 A b. 9.4 A c..8 A d A ΔV 4.5 V R A R 8 Δ Answ d 5. Th sistos connctd in paalll hav potntial dincs acoss thm labld V, V, and V. Which o th ollowing xpsss th potntial dinc acoss all th sistos? a. ΔV + ΔV + Δ b. ΔV t V Δ V t ΔV ΔV ΔV c. Δ + + ΔV ΔV ΔV V t d. Δ V t ΔV + ΔV n paalll all o th lctic potntial dincs a th sam. Answ b + ΔV 6. Two sistos with valus o 6.0 Ω and Ω a connctd in paalll. This combination is connctd in sis with a.0 Ω sisto and a 4 V batt. What is th cunt in th.0 Ω sisto? a..0 A b. 4.0 A c. 6.0 A d. A R6 R 6 ΔVt 4 t 4A 6 R 6 R & & q 4 R q Answ b R 6 + R 4 + 6Ω Δ V R ΔV R Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag 6 o 0

7 7. Which o th ollowing situations is not tu o magnts? a. Lik pols pl ach oth. b. Unlik pols pl ach oth. c. Noth pols pl ach oth. d. A noth pol and a south pol will attact ach oth. This is th law o pols. Lik pols pl. Unlik pols attact. Answ b. 8. What is th quivalnt sistanc o th sistos in th igu shown at ight? a.. Ω b.. Ω c..0 Ω d..0 Ω Th top th sistos a in sis so R top R + R Ω R R 9 q Ω Rtop Rbottom 9 4 Answ b Alwas ound to an vn numb whn it nds in a pct 5. Rtop and R bottowm a in paall so 9. Which compass ndl ointation in th igu at lt might coctl dscib th magnt s ild at that point? a. a b. b c. c d. d Th B ild points om th Noth pol to th South pol. Answ a 0. A.0 m wi sgmnt caing a cunt o 0.60 A ointd paalll to a uniom magntic ild o 0.50 T xpincs a oc o what magnitud? a N b. 0.0 N c. 0.5 N d. 0.0 N ( 0 ) sin( 80 ) 0 B LBsin θ LBsin LB Answ d. Two idntical mtal sphs on insulating stands a oiginall 0.5 m apat. On o th mtal sphs cais a chag o.5 μc and th oth sph cais an unknown, positiv chag. Th two sphs a bought in to contact with on anoth and thn tund to th oiginal distanc apat. th Coulomb oc acting on on o th sphs is now.76 N, what was th chag on th nd sph bo th two w bought in to contact? a. 5.5 x 0-9 C b.. x 0-8 C c.. x 0-5 C d. 5.5 x 0-6 C Whn th two sphs a bought in to contact, th chags will mov to ach quilibium. n oth wods, q q q. Tho, (.5) (.76) kq q kq 0 kq q k q q C q 9 i + q q + q q + q q q q q q i ( )( ) Answ d & i i i Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag 7 o 0 k

8 . An objct that is 8 cm om a convging lns oms a al imag.5 cm om th lns. What is th magniication o th imag? a..5 b c d..5 q.5 M.5 Answ a p 8. A small, chagd paticl (q -.7 nc, m 6. mg) in a constant lctic ild as shown, is hanging b a thad om th ciling at an angl o º with th vtical. What is th magnitud o th Elctic ild? (Th paticl is at st.) a. 58 kn/c a. 58 kn/c b. kn/c c. 58 x 0 6 N/C d. x 0 6 N/C Stat b dawing th Bod Diagam. Not that bcaus th E ild is to th lt th on this ngativ chag will b to th ight (bcaus an lctic ild is dind b a positiv chag). E q g kg m 6.mg 000mg 000g qe Now bak th tnsion into its componnts kg di x di T g T x ma A T cosθ T H T T cosθ O Tx sinθ Tx H T T sinθ Rdaw th BD ma 0 T 0 T x g mg T cosθ mg T cosθ qe mg T sinθ qe T sinθ cosθ 6 ( 6. 0 )( 9.8) tan( ) mg sinθ mg tanθ + 4 N kn E q cosθ q.7 0 C C Answ b Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag 8 o 0

9 4. n what diction dos a ocal a om an objct pocd at passing though a convging lns? a. Th a passs though th ocal point,. b. Th a passs though th cnt o th lns. c. Th a xits th lns paalll to th pincipal axis. d. Th a intscts with th cnt o cuvatu, C. ocal Ra Answ c 5. Which o th ollowing is quivalnt to a Tsla? kg kg m kg kg a. b. c. d. C s C s A m C s B B N kg m kg qvb sinθ B answ d. qv sinθ m m C s C C s s s 6. Whn a staight lin is dawn ppndicula to a lat mio at th point wh an incoming a stiks th mio s suac, th angls o incidnc and lction a masud om th nomal and a. th angls o incidnc and lction a qual. b. th angl o incidnc is gat than th angl o lction. c. th angl o incidnc is lss than th angl o lction. d. th angl o incidnc can b gat than o lss than th angl o lction. B dinition, th angl o incidnc and th angl o lction a alwas th sam. Answ a 7. Pat o a pncil that is placd in a glass o wat appas bnt in lation to th pat o th pncil that xtnds out o th wat. What is this phnomnon calld? a. intnc b. action c. diaction d. lction Th light is bnt awa om o towad th nomal (dpnding on diction) bcaus th spd o light is slow in wat than in ai. This is calld action. Answ b 8. Light with a wavlngth o nm passs though a lins/cm diaction gating. What is th scond-od angl o diaction? a.. b. 5. c d lins 00cm 6 lins mλ 0 0 d sin θ mλ sinθ θ sin d cm m m d 6 9 θ sin Answ b mλ d ; ( ) ( )( )( ) Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag 9 o 0

10 B BB 9. Th igu shown at lt dmonstats chaging b a. gounding. b. induction. c. polaization. d. contact. Th insulato has bn polaizd b th chagd objct; th ngitvs and positivs a lind up. Answ c 40. A colo TV daws about.5 A whn it is connctd to a 0 V outlt. Assuming lctical ng costs $0. p kwh, what is th cost o unning th TV o xactl 8 hous? a. $0.09 b. $0.0 c. $0.9 d. $.0 kw P ΔV 4 000W $0..4kWh $0.88 Answ c kwh (.5)( 0) 00watts 00watts 8hous 400Wh. kwh 4. Und which o th ollowing conditions is th nt magntic oc on a chagd paticl qual to zo? a. whn th paticl is stationa b. whn th paticl is moving paalll to th magntic ild c. whn th paticl is not chagd d. all o th abov B qvb sinθ a. v 0 thn B 0 b. i θ 0 o θ 80 thn sinθ 0 & c. q 0 thn B B 0 Answ d. 0 Palm Alwas Show You Wok! pintd 4/7/ Pactic inal Exam CPP - Wint - - Multipl Choic (# Solutions).doc Pag 0 o 0