[PDF] Collegeboard SAT Physics Form 4DAC2.pdf | Plain Text

PHYSICSTEST Note: Tosimplify calculations, youmay useg = 10 m/s2 forthe acceleration duetogravity atEarth's surface. Part A Directions: Eachsetoflettered choicesbelowreferstothe numbered questionsimmediately followingit.Select the one lettered choicethatbest answers eachquestion, andthen fillinthe corresponding circleonthe answer sheet. A choice maybeused once, morethanonce, ornot atall ineach set. Questions 1-3 Questions 4-6 The graph below shows thetemperature ofa sample ofpure water asafunction ofthe energy added tothe sample. Thewater isinitially iceand is then taken through theliquid andgaseous phases. Each choice belowgivesapossible newvalue for one quantity asaresult ofachange invalue of another quantity. (A) One-fourth itsoriginal value (B) One-half itsoriginal value (C) Equal toits original value (D) Twice itsoriginal value (E) Four times itsoriginal value D E 4.An object, starting fromrest,falls acertain distance in aconstant gravitational field.Airresistance is negligible. Ifthe mass ofthe object weretwice as great andtheobject againstarted fromrest,what would bethe new time itwould taketofall the same distance? Energy Added 1. Portion ofthe graph corresponding tothe water boiling 5.An object moves withuniform circularmotion. If the tangential speedofthe object weretwice as great, buttheradius ofthe path were thesame, what would bethe new centripetal forceonthe object? 2. Portion ofthe graph corresponding tothe liquid water getting warmer 3. Portion ofthe graph corresponding tothe ice melting 6.An electron movesperpendicular toamagnetic field. Ifthe magnetic fieldstrength weretwice as great, butthespeed ofthe electron werethesame, what would bethe new force onthe electron due to the magnetic field? 4DAC2 I GO ONTOTHE NEXT PAGE> Unauthorized copyingorreuse of any part ofthis page illegal. -158-

PHYSICS TEST-Continued The table below includes threeproperties ofthe netforce on anobject: themagnitude, direction,andangle withrespect to the object's path.Foreach situation inthe questions thatfollow, select thechoice thatindicates whetherthesequantities are constant orchanging duringthecourse ofthe motion. 7. Ablock sliding downafrictionless inclinedplane 9. Aprojectile following aparabolic trajectory nearEarth's surface e 8.Asatellite inacircular orbit Questions 7-9 Magnitude of Net Force (A) Constant (B) Constant (C) Constant (D) Changing (E) Changing Direction of Net Force Constant Constant Changing Constant Changing e orizedcopying orreuse of part ofth page illegal. -159-Angle ofNet Force with Respect toPath Constant Changing Constant Constant Constant I GO ON TOTHE NEXT PAGV

PHYSICS TEST-Continued Questions 10-11refertothe following particles. Questions14-15 (A) Electron (B) Neutron (C) Neutrino (D) Photon (E) Positron The following arepositions atwhich electric or magnetic fieldsmayexist. Assume thatineach positi there arenoelectric ormagnetic fieldsotherthan those due tothe charges orcurrents mentioned. 10. Ofthe particles listed,whichhasthegreatest mass? (A) Inside acharged hollowmetalsphere (B) Inthe vicinity ofabar magnet (C) Inthe vicinity ofan electric pointcharge (D) Midway between twoinfinitely longand wide parallel platescarrying chargesof equal magnitude andthesame sign (E) Midway between twoinfinitely longparallel wires carrying equalcurrents inthe same direction 11. Which particle isclassified asantimatter? Questions 12-13 The diagram belowshows charges of+3 and -3 coulombs. Pisapoint onthe perpendicular bisector of the line segment thatconnects thetwo charges. 14. Where mustthere existanelectric fieldthatis not equal tozero? P T I I I I I --------t-------~ -3C I +3C I North West + East South 15. Where mustthere existamagnetic fieldthatis !!Qt equal tozero? (A) North (B) South (C) East (D) West (E) Outofthe page 12. The electric fieldatpoint P isin what direction? 13. Anegative chargelocated atP, ifreleased from rest, would initially moveinwhat direction? GOONTOTHE NEXT PAGE Unauthorized copyingorreuse of any part ofthis page illegal. -160-

t PHYSICS TEST-Continued Questions 16-17 n In the following circuit,Al'A2' A3' A4'and Asare ammeters, eachhaving zeroresistance andconnected asshown. 6 ohms 30 volts 3ohms 1------1...---{ As1--_-' 1 (A)Alonly (B) A3only (C) Aland A4only (D) A2and Asonly (E) AI'A2'and A3only ot 16.The greatest currentismeasured bywhich ofthe ammeters? 17. The smallest currentismeasured bywhich ofthe ammeters? Unauthorized copyingorreuse of any part ofth page illegal. I GO ONTOTHE NEXT PAGE> -161-

Unauthorizedcopyingorreuse of any part ofth page illegal. I GO ONTOTHE NEXT PAGE> PHYSICS TEST-Continued Questions 18-19refertothe following typesof images thatmay beformed whenanobject is placed infront ofalens ormirror. I. Real image, largerthantheobject II. Real image, smaller thantheobject III. Virtual image (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III FrontsUrface~~of mirror ~ 18. Which ofthese types ofimages canbeformed by the convex mirrorshown above? 19. Which ofthese types ofimages canbeformed by the converging lensshown above? -162-

PHYSICS TEST-Continued Directions: Eachofthe questions orincomplete statementsbelowisfollowed byfive suggested answersor completions. Selecttheone that isbest ineach case andthen fillinthe corresponding circleonthe answer sheet. 20. On atrip toWashington, D.C.,agroup ofstudents runs upthe steps ofthe Capitol building. Ifthey all start together andstop atthe top atthe same time, which ofthe students expended thegreatest average powerinovercoming gravitytomake the climb? (A) The heaviest (B) The lightest (C) They allexpended thesame average nonzero power. (D) None ofthem expended power,sinceenergy is always conserved. (E) Itcannot bedetermined fromtheinformation given. 21. Which ofthe following wouldactonasled sliding downahill ofconstant slopeinstill air? I. The gravitational pulltoward thecenter of the Earth II. Africtional forceparallel tothe surface III. Aretarding forceduetoair resistance (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III Unauthorized copyingorreuse of any part ofth page illegal. PartB 22.Aball isdropped fromahigh tower. Forces acting onthe ball while itfalls include whichof the following? I. A gravitational forceexerted bythe Earth II. Africtional forceexerted bythe air III. Aretarding forceduetothe mass ofthe ball (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III 23. Which ofthe following changeswouldmostlikely decrease theperiod ofthe simple pendulum shown above? (A) Moving thependulum toahigher elevation (B) Increasing thesize ofthe arcthrough which the bob swings (C) Increasing themass ofthe bob (D) Decreasing themass ofthe bob (E) Decreasing thelength ofthe string I GO ONTOTHE NEXT PAGE> -163-

PHYSICS TEST-Continued y r-~--+--~--~-t 24. The vertical displacement y of aball isgiven asa function oftime tin the graph above. Theball could beinwhich ofthe following situations? I. In free fallunder theinfluence ofaconstant gravitational force II. Floating inaripple tank III. Attached tothe end ofavertical spring (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III 25. Energy flowsfromtheheated waterinaclosed plastic cuptothe airinaroom atthe rate of 12 watts. Ifthe cup had been made ofthe same plastic but4times asthick andthetemperature difference hadremained unchanged, therate of heat transfer wouldhavebeen most nearly (A) 3W (B) 6W (C) 12W (D) 24W (E) 48W Unauthorized copyingorreuse of any part ofth page illegal. 80 79 78 77 26. Astudent takingatemperature measurement observes themercury levelinaCelsius thermometer, asshown inthe figure above. Which ofthe following isthe best way torecord the temperature indicatedbythe thermometer? (A) 78.0°C (B) 78.00°C (C) 78.02°C (D) 78.2°C (E) 78.25°C Glass n = 1.5 27. Alaser beam isincident onaglass platethathas parallel sidesandanindex ofrefraction nof 1.5. Some lightisreflected atan angle of60° tothe normal andsome lightistransmitted throughthe glass, asshown above. Whatisthe value ofthe sine ofthe angle ()made bythe transmitted beam? (A) 1.5tan 60° (B) 1.5cos 60° (C) 1.5 sin60° (D) cos60° 1.5 (E) sin60° 1.5 I GO ONTOTHE NEXT PAGE> -164-

PHYSICS TEST-Continued Unauthorized copyingorreuse of any part ofth page Illegal. 28. Two musical soundsofdifferent frequency are produced onapiano. Whencompared tothe sound ofsmaller frequency, thesound ofgreater frequency musthavewaves withwhich ofthe following characteristics? I. Greater amplitude II. Shorter wavelength III. Shorter period (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III 29. Which ofthe following isaphenomenon thatis observed forlight waves inair but notforsound waves inair? (A) Polarization (B) Interference (C) Diffraction (D) Dispersion (E) Resonance 30. Ocean waves passbyapost atafrequency of 3 crests perminute. Whatisthe period ofthe waves? (A) 1 . "3 mmute (B) 3minutes (C) 1. 1 "3 minute" (D) 3 minutes"! (E) Itcannot bedetermined unlessthespeed of the waves isknown. 31. Ifasatellite inacircular orbitmoves withconstant speed, thenits (A) momentum changesindirection (B) potential energychanges inmagnitude (C) potential energychanges indirection (D) kinetic energychanges indirection (E) centripetal andtangential accelerations are both zero 32. Ball Xisthrown straight downfromthetop ofa building withagiven initial speed. Atthe same time another ball Y isthrown straight upfrom the top ofthe building withthesame initial speed. Air resistance isnegligible. Ifball Xhas aspeed v just before hitting theground, whatisY's speed just before hitting theground? (A) 4v (B) 2v (C) v (D) v/2 (E) v/4 33. Anobject withzeroacceleration would (A) move alongthetrajectory ofaprojectile (B) change speedwithout changing direction (C) change direction withoutchanging speed (D) maintain uniformcircularmotion (E) maintain uniformspeedanddirection I GO ONTOTHE NEXT PAG{> -165-

PHYSICS TEST-Continued Questions 34-35 A 2-kilogram objectisaccelerated fromrestata rate of5meters persecond squared alongastraight- line path byanet force. 34. What isthe magnitude ofthe netforce onthe object? (A) 0.4N (B) 2.5 N (C) 5N (D) 10N (E) 20 N 35. What willbethe speed ofthe object 4seconds after itbegins moving? (A) 5 mls (B) 10 mls (C) 20mls (D) 40 mls (E) 320m/s 36. You aregiven onlyacoil ofwire, abattery of unknown emf,andconnecting wiresandareasked to determine theresistance ofthe coil. Which of the following additional instruments shouldyou request? I.Avoltmeter II. An ammeter III. Anelectroscope (A) Ionly (B) IIonly (C) IIIonly (D) Iand IIonly (E) IIand IIIonly Unauthorized copyingorreuse of any part ofth page IsIllegal. 37. The electric forcebetween twosmall charged spheres isincreased from F to 4F. This can occur ifthe (A) distance between thespheres isincreased from r to 2r (B) distance between thespheres isdecreased 1 from r to 4"r (C) charge oneach sphere isdecreased from q 1 to 2"q (D) charge ononly oneofthe spheres isincreased from qto 2q (E) charge ononly oneofthe spheres isincreased from qto 4q 38. The force thattwo straight, parallelcurrent- carrying wiresegments exertoneach other depends onwhich ofthe following? I. Currents inthe two wires II. Lengths ofthe wires III. Distance betweenthewires (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III 39. Ofthe following objects,whichwould mostlikely be visible tothe human eyeinan otherwise dark room? (A) Amirror (B) Atungsten wireheated to1,500°C (C) Apiece ofwhite paper (D) Apiece ofuranium (E) Ahot steam iron GO ONTOTHE NEXTPAGE -166- 4

PHYSICS TEST-Continued 40. A diver islying atthe bottom ofacalm poolof water. Abird isin atree above thewater, directly over thediver's feet.Correct statements aboutthis situation includewhichofthe following? I. To the diver, thebird willappear tobe higher above theground thanitactually is. II. To the diver, thebird andthetree will be inverted becausethesurface ofthe pool behaves likealens. III. The bird cannot seethediver because the light istotally reflected bythe surface ofthe water. (A) I only (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III 41. A glass cover inatraffic signalappears redwhen lit by aclear bulbbecause thecover (A) increases thespeed ofred light (B) transmits mostvisible lightexcept red (C) absorbs mostvisible lightexcept red (D) reflects onlyredlight (E) absorbs onlyredlight 42. According tothe conservation ofcharge principle, when charged particles interact,whichofthe fol- lowing iscertain tobe true? (A) The charge oneach particle remains thesame. (B) The number ofcharged particles isthe same before andafter theinteraction. (C) The total netcharge ofthe particles isthe same before andafter theinteraction. (D) The total netcharge ofall the particles can change duringtheinteraction onlybyan amount equaltoan integer timesthecharge on anelectron. (E) The total netcharge onthe particles can increase onlyif,inalater interaction, the total netcharge decreases byanequal amount. Unauthorized copyingorreuse of any part ofthis page illegal. 43. Light waves offrequency 6.0x 10 17 hertz cause acertain atomtobe excited fromenergy level Xtoenergy levelY.Which ofthe following is most nearly thedifference inenergy between these twolevels? (Planck's constantis 6.63 x 10- 34 joule-second.) (A) 4.0 x 10- 22 J (B) 4.0 x 10- 19 J (C) 4.0 x 10- 16 J (D) 4.0 x 10- 13 J (E) 4.0 x 10- 10 J 44. Atroom temperature, theresistance ofapiece of acertain superconducting materialis 10 ohms. When thetemperature ofthe material dropsbelow its critical temperature (Tc = 20 K), itsresistance becomes (A) zero (B) 0.5 n (C) 2n (D) IOn (E) infinite 45. The length andwidth ofarectangular plateare measured as6.04 centimeters and3.48 centi- meters, respectively. Thearea ofthe plate isthen calculated (lengthtimeswidth) usinganelectronic calculator. Thecalculator displaystheproduct as 21.0192. Assuming thelength andwidth measure- ments areexpressed tothe proper experimental accuracy, whichofthe following isthe most appropriate statementofthe area? (A) 21cm2 (B) 21.0 cm2 (C) 21.02 cm2 (D) 21.019 cnr' (E) 21.0192 cm2 I GO ONTOTHE NEXT PAGV -167-

PHYSICS TEST-Continued 46. A2-kilogram boxisplaced onascale inan elevator. Whentheelevator isnot moving, the reading onthe scale is20 newtons. Whenthe elevator isaccelerating upwardat2m/s ',the reading onthe scale willbemost nearly (A) 40N (B) 24N (C) 18N (D) 17N (E) 4N 08m1S ~ . . 8 2m/s1.0 kg • 47. A0.2-kilogram disksliding at8meters persecond on atable withnegligible friction,asshown above, strikes a1.0-kilogram disksliding at 2 meters per second inthe same direction. Afterthecollision the 0.2-kilogram diskslides backward at2mete~s per second. Whatisthe speed ofthe l:O-kilogram disk after thecollision? (A) 1.2mls (B) 2.0mls (C) 3.2mls (D) 4.0mls (E) 8.0mls Unauthorized copyingorreuse of any part ofth page illegal. 5 ~ 4 Z '-' 3 e o 2 ~ 1 01L-+-+-~~-+-+~--~~~ 12 34 567 89 10 Distance (m) 48. The graph above shows theforce thatacts on an object inonly onedirection versusthedistance the object moves inthat direction. Whatisthe total work doneonthe object bythis force? (A) 10J (B) 20J (C) 25 J (D) 40J (E) 50J 49. Acharged O.lO-farad capacitorhasanaverage current of2amperes drawnfromitduring a O.lO-second interval.Themagnitude ofthe change involtage acrossthecapacitor ismost nearly (A) 0.2V (B) 0.5 V (C) 2V (D) 50V (E) 200V I GO ONTOTHE NEXT PAGE>

51.Aleaf electroscope isgiven anegative charge,as shown aboveinFigure I.Then acharged sphereis brought neartheelectroscope andtheleaves are observed tocome closer together, asshown in Figure II.Which ofthe following mustbetrue of the sphere? (A) Itis grounded. (B) Itis aconductor. (C) Itis anonconductor. (D) Ithas anegative charge. (E) Ithas apositive charge. PHYSICS TEST-Continued 50. Two point charges areadistance rapart. Which of the following bestshows theelectric force F on either charge asafunction ofr? (A) 1~~ (B)F~ OrO r (C) FlL (D) F~ 0 r 0 r (E) Ft= o r Figure I Unauthorized copyingorreuse of any part ofth page Isillegal. -169- Figure II I GO ONTOTHE NEXT PAGE>

PHYSICS TEST-Continued 52. Scientists wereledtothe nuclear modelofthe atom bythe results ofexperiments inwhich (A) a-particles weresentthrough thingold foil (B) thespectrum ofatomic hydrogen was observed (C) charged particles weresuspended inan electric field (D) light wasshone onclean metal surfaces and the resulting electriccurrents were investigated (E) x-rays werediffracted throughpurecrystals 53. The mass ofan electron atrest isapproximately 9 x 10- 31 kilogram. Ifthis mass werecompletely converted toenergy, theamount ofenergy produced wouldbemost nearly (A) 10- 21 J (B) 10- 13 J (C) 10- 8J (D) 10-3 J (E) 102 J Questions 54-55 A:....-_••. _~B L...---+--+---t--_ V(nr') 123 The figure aboveshows thePV diagram foran expanding idealgasthat goes from state A to state B. 54. How much workisdone bythe gas asitexpands? (A) 1 x 105 J (B) 2 x 10 5 J (C) 4 x 105 J (D) 6 x 105 J (E) 8 x 105 J 55. Which ofthe following indicateswhathappens as the gas expands? (A) Heat isadded andthetemperature increases. (B) Heat isadded andthetemperature decreases. (C) Heat isremoved andthetemperature increases. (D) Heat isremoved andthetemperature decreases. (E) Heat isremoved andthetemperature stays constant. Unauthorized copyingorreuse of GOONTOTHE NEXT PAGE any part ofth page illegal. -170-

PHYSICS TEST-Continued 56. AlO-kilogram steelballisdropped fromthetop of atower 100meters high.Thekinetic energyof the ball just before itstrikes theground ismost nearly (A) 10 J (B) 100 J (C) 1,000J (D) 10,000 J (E) 100,000 J s? 1-1·---- D-----1·1 Note: Figure notdrawn toscale. as 57. The figure above shows thetrajectory ofasoccer ball kicked byaplayer. Thespeed withwhich the ball leaves theplayer's footisvo' andtheinitial angle between atangent tothe trajectory andthe horizontal is 8 0, Ifair resistance isnegligible, which ofthe following iscertain toincrease both the distance Dofthe kick andthetime theball is in the air? es. es. s (A) Increasing both Vo and 8 0 (B) Increasing Vo and decreasing 8 0 (C) Increasing Vo and keeping 8 0 unchanged (D) Keeping Vo unchanged andincreasing 80 (E) Keeping Vo unchanged anddecreasing 8 0 Unauthorized copyingorreuse of any part ofth page Illegal. 58. Aprojectile isfired from ground levelatan angle of 60°. Airresistance isnegligible. Whichofthe following istrue ofthe projectile's velocityand acceleration vectorsatthe highest pointofits path? Velocity Vector (A) Equals zero (B) Equals zero (C) Points horizontally (D) Points horizontally (E) Points vertically Acceleration Vector Equals zero Points down Equals zero Points down Points down 59. Which ofthe following isacompletely inelastic collision? (A) Aball rebounds againstawall, reversing its velocity. (B) Two balls collide headon,each reversing its velocity. (C) Two balls collide, sticktoeach other, and move together afterthecollision. (D) Two balls collide andmove ataright angle to each other afterthecollision. (E) Aball with velocity vcollides withaball at rest; after thecollision thefirst ballisatrest and thesecond ballhasvelocity v. I GO ONTOTHE NEXT PAGE> -171-

PHYSICS TEST-Continued Force 60. Aforce actsonanobject forashort timeinterval 6.t, asshown onthe graph above. Thearea under the curve isequal tothe change inwhich ofthe following? (A) Momentum (B) Acceleration (C) Work (D) Kinetic energy (E) Speed o 61. Two planets thatarefarapart havethesame mass, but planet Y has aradius 3times thatofplanet X, as shown above. If a isthe acceleration dueto gravity onthe surface ofplanet X,what isthe acceleration duetogravity onthe surface of planet Y? (A) 9a (B) 3a (C) a (D) a/3 (E) a/9 Unauthorized copyingorreuse of any part ofth page illegal. -172-62. What isthe frequency ofan electromagnetic wave ofspeed 3x 108 meters persecond whose wavelength is0.20 meter? (A) 1.5 x 107 Hz (B) 6 x 107 Hz (C) 3X 108 Hz (D) 1.5x109 Hz (E) 6 x 109 Hz 6 63. Sound wavesoffrequency 107hertz areused to destroy tumorsinsoft tissues. Ifthe speed ofsound is 330 meters persecond inair and is4times faster in soft tissue, truestatements aboutthesewaves include whichofthe following? I. Their wavelength inair is3.3 x10-5 m. II. Their wavelength intissue is3.3 x10- 5 m, III. Their frequency intissue is2.5 x106 Hz. (A) Ionly . (B) IIonly (C) Iand IIIonly (D) IIand IIIonly (E) I,II, and III 64. Asiren onafire truck creates asound of frequency f when thetruck isatrest. Which of the following correctlyexplainswhythe frequency ofthe siren heard byastationary observer ishigher than f when thetruck is moving towardtheobserver? (A) The velocity ofthe waves isequal tothe velocity ofsound inair plus thetruck's velocity. (B) Themotion ofthe truck causes adecrease in the wavelength ofwaves reaching the observer. (C) The motion ofthe truck causes anincrease in the amplitude ofwaves reaching the observer. (D) Different partsofthe sound waveinterfere because onepart moves fasterthanthe other. (E) The siren creates ahigher frequency sound when thetruck ismoving. I GO ONTOTHE NEXT PAGE>

d r m > PHYSICS TEST-Continued 67.Astraight wireismoved withuniform velocityin a magnetic fieldsuchthatanemf isinduced inthe wire. Theinduced emfdepends onwhich ofthe following? I.The speed withwhich thewire ismoved II. The length ofthe wire thatisin the magnetic field III. The strength ofthe magnetic field (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III M __ -----;:7P 65. Two wave sources, M and N, are vibrating in , phase onthe surface ofwater andgenerate waves of wavelength A. Which ofthe following values for the distances MPandNPwill result in minimum disturbance ataparticular point P on the surface ofthe water? MP I. 5,1, II. 5,1, III. 5,1, JL.... --:;.T_ 68. The block shown aboveispulled overarough horizontal surfacebythe tension Tinthe string. The velocity ofthe block doesnotchange and therefore itmay becorrectly inferredthat (A) theinertial massofthe block isinfinite (B) theinertial massofthe block iszero (C) theforce offriction isequal inmagnitude to the tension (D) theblock willcontinue tomove ataconstant velocity ifT isreduced tozero (E) thisconstant velocitycondition canbemain- tained byatension ofany desired value (A) Ionly (B) IIIonly (C) Iand IIonly (D) IIand IIIonly (E) I,II, and III 66. Abar magnet isheld near acoil ofwire whose ends areattached toan ammeter Aasshown above. Theammeter willregister acurrent under which ofthe following conditions? I. The magnet andcoil aremoving tothe right with thesame velocity. II. The magnet ismoving tothe right orleft and the coil isstationary. III. The magnet andcoil aremoving towardeach other. (A) Ionly (B) IIonly (C) Iand IIonly (D) IIand IIIonly (E) ,I,II, and III Unauthorized copyingorreuse of any part ofth page Illegal. I GO ONTOTHE NEXT PAGE> -173-

PHYSICS TEST-Continued 0.20 kg 69. Aspring scalewithamass of0.20 kilogram is attached atone end toawall, asshown above. The other endofthe scale isattached toablock of mass M byastring thatpasses overafrictionless pulley, sothat theblock hangs freely. Thespring scale registers 10newtons. Themass M ofthe block ismost nearly (A) 0.8kg (B) 1.0kg (C) 1.2 kg (D) 1.5kg (E) 2.0kg 70. Askydiver jumpsfromanairplane thatismoving at 50 meters persecond ataheight of1,000 meters. Which ofthe following correctlydescribes thesky- diver's energyimmediately afterleaving theair- plane? (Assume potentialenergyiszero atground level.) (A) Allpotential energy (B) Allkinetic energy (C) Equal amounts ofkinetic andpotential energy (D) More kinetic energythanpotential energy (E) More potential energythankinetic energy 71. Abeam oflight hasawavelength A. in air. Ifthe beam passes fromairinto water, whichhasan index ofrefraction of4/3 ,its wavelength inthe water is (A) A. 4 3A. 4 A. 3A. 4A. (B) (C) (D) (E) Unauthorized copyingorreuse of any part ofth page Isillegal. 72. The bottom halfofaconverging lensiscovered so that light from anobject canonly passthrough the top half ofthe lens. What image willappear on ascreen onthe opposite sideofthe lens? (A) The entire object (B) The tophalf ofthe object only (C) The bottom halfofthe object only (D) Abright spot (E) Noimage; thescreen willbedark. n D· 1 """ Vo = 2 mJ , 5m \ \ \ \ \ f.-x---j Note: Figure notdrawn toscale. 73. Aworker accidentally kicksascrap oflumber off the flat roof ofabuilding, givingitan initial horizontal speed Vo of2meters persecond. The building is5meters high,asshown above.Ifair resistance isnegligible, thedistance xfrom the edge ofthe building towhere thewood scrap lands ismost nearly (A) 0.5 m (B) 1.0 m (C) 2.0m (D) 5.0 m (E) 10m I GO ONTOTHE NEXT PAGE> -174-

) TargetArea Slit Beamof \ Particles •• • 74. Particles enteraslit inarotating drumofknown diameter androtation speed,asshown above. They strike thedarkened regionofthe target inside thedrum, which isat aknown anglefrom the slit. With noadditional data,thisexperiment can beused todetermine whichofthe following properties ofthe particles? (A) Mass (B) Speed (C) Charge (D) Momentum (E) Energy PHYSICS TEST-Continued 75.Acar moves alongastraight roadatconstant speed untilitsbrakes areapplied. Thecarthen slows downuntilitcomes toastop. Three quantities aremeasured: thecar's mass, the initial velocity ofthe car, andthetime ittook to bring thecartoastop. Which ofthe following can becalculated fromthisinformation? I. The average deceleration ofthe car II. The average netforce exerted onthe car III. The average powerexpended whilethe brakes areapplied (A) Ionly (B) IIonly (C) IIIonly (D) Iand IIonly (E) I,II, and III STOP IF YOU FINISH BEFORE TIMEISCALLED, YOUMAY CHECK YOURWORK ONTHIS TEST ONLY. DO NOT TURN TOANY OTHER TESTINTHIS BOOK. Unauthorized copyingorreuse of any part ofthis page isIllegal. -175-