GRADE/GRAAD 12 JUNE/JUNIE 2017 PHYSICAL SCIENCES P1/ FISIESE WETENSKAPPE V1 MEMORANDUM

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1 NATIONAL/NASIONALE SENIOR CERTIFICATE/SERTIFIKAAT GRADE/GRAAD 12 JUNE/JUNIE 2017 PHYSICAL SCIENCES P1/ FISIESE WETENSKAPPE V1 MEMORANDUM MARKS/PUNT: 150 Thi memorandum conit of 16 page./ Hierdie memorandum betaan uit 16 bladye.

2 2 PHYSICAL SCIENCES P1 (EC/JUNE 2017) GENERAL GUIDELINES/ALGEMENE RIGLYNE 1. CALCULATIONS/BEREKENINGE 1.1 Mark will be awarded for: correct formula, correct ubtitution, correct anwer with unit. Punte al toegeken word vir: korrekte formule, korrekte ubtituie, korrekte antwoord met eenheid. 1.2 No mark will be awarded if an incorrect or inappropriate formula i ued, even though there are many relevant ymbol and applicable ubtitution. Geen punte al toegeken word waar ʼn verkeerde of ontoepalike formule gebruik word nie, elf al i daar relevante imbole en relevante ubtituie. 1.3 When an error i made during ubtitution into a correct formula, a mark will be awarded for the correct formula and for the correct ubtitution, but no further mark will be given. Wanneer ʼn fout gedurende ubtituie in ʼn korrekte formule begaan word, al ʼn punt vir die korrekte formule en vir korrekte ubtituie toegeken word, maar geen verdere punte al toegeken word nie. 1.4 If no formula i given, but all ubtitution are correct, a candidate will forfeit one mark. Indien geen formule gegee i nie, maar al die ubtituie i korrek, verloor die kandidaat een punt. 1.5 No penaliation if zero ubtitution are omitted in calculation where correct formula/principle i correctly given. Geen penaliering indien nulwaarde nie getoon word nie in berekeninge waar die formule/beginel korrek gegee i nie. 1.6 Mathematical manipulation and change of ubject of appropriate formulae carry no mark, but if a candidate tart off with the correct formula and then change the ubject of the formula incorrectly, mark will be awarded for the formula and correct ubtitution. The mark for the incorrect numerical anwer i forfeited. Wikundige manipulaie en verandering van die onderwerp van toepalike formule tel geen punte nie, maar indien ʼn kandidaat met die korrekte formule begin en dan die onderwerp van die formule verkeerde verander, al die punte vir die formule en korrekte ubtituie toegeken word. Die punt vir die verkeerde numeriee antwoord word verbeur. 1.7 Mark are only awarded for a formula if a calculation ha been attempted, i.e. ubtitution have been made or a numerical anwer given. Punte word leg vir ʼn formule toegeken indien ʼn poging tot ʼn berekening aangewend i, d.w.. ubtituie i gedoen of ʼn numeriee antwoord i gegee. 1.8 Mark can only be allocated for ubtitution when value are ubtituted into formulae and not when lited before a calculation tart. Punte kan leg toegeken word vir ubtituie wanneer waarde in formule ingetel word en nie vir waarde wat voor ʼn berekening gely i nie. Kopiereg voorbehou Blaai om aeblief

3 (EC/JUNIE 2017) FISIESE WETENSKAPPE V All calculation, when not pecified in the quetion, mut be done to a minimum of two decimal place. Alle berekening, wanneer nie in die vraag gepeifieer word nie, moet tot ʼn minimum van twee deimale plekke gedoen word If a final anwer to a calculation i correct, full mark will not automatically be awarded. Marker will alway enure that the correct/appropriate formula i ued and that working, including ubtitution, are correct. Indien ʼn finale antwoord van ʼn berekening korrek i, al volpunte nie outomatie toegeken word nie. Naiener al altyd vereker dat die korrekte/toepalike formule gebruik word en dat bewerking, inluitende ubtituie korrek i Quetion where a erie of calculation have to be made (e.g. a circuit diagram quetion) do not necearily alway have to follow the ame order. FULL MARKS will be awarded provided it i a valid olution to the problem. However, any calculation that will not bring the candidate cloer to the anwer than the original data, will no count any mark. Vrae waar ʼn reek berekeninge gedoen moet word (bv. ʼn troombaandiagramvraag) hoef nie noodwendig dieelfde volgorde te hê nie. VOLPUNTE al toegeken word op voorwaarde dat dit ʼn geldige oploing vir die probleem i. Enige berekening wat egter nie die kandidaat nader aan die antwoord a die oorpronklike data bring nie, al geen punte tel nie. 2. UNITS/EENHEDE 2.1 Candidate will only be penalied once for the repeated ue of an incorrect unit within a quetion. Kandidate al leg een keer gepenalieer word vir die herhaaldelike gebruik van ʼn verkeerde eenheid in ʼn vraag. 2.2 Unit are only required in the final anwer to a calculation. Eenhede word leg in die finale antwoord op ʼn vraag verlang. 2.3 Mark are only awarded for an anwer, and not for a unit per e. Candidate will therefore forfeit the mark allocated for the anwer in each of the following ituation: Correct anwer + wrong unit Wrong anwer + correct unit Correct anwer + no unit Punte al leg vir ʼn antwoord en nie vir ʼn eenheid per e toegeken word nie. Kandidate al die punt vir die antwoord in die volgende gevalle verbeur: Korrekte antwoord + verkeerde eenheid Verkeerde antwoord + korrekte eenheid Korrekte antwoord + geen eenheid 2.4 SI unit mut be ued except in certain cae, e.g. V. m -1 intead of N. C -1, and cm. -1 or km. h -1 intead of m. -1 where the quetion warrant thi. SI eenhede moet gebruik word, behalwe in ekere gevalle, bv. V. m -1 in plaa van N. C -1, en cm. -1 of km. h -1 in plaa van m. -1 waar die vraag dit regverdig. Copyright reerved Pleae turn over

4 4 PHYSICAL SCIENCES P1 (EC/JUNE 2017) 3. GENERAL/ALGEMEEN 3.1 If one anwer or calculation i required, but two are given by the candidate, only the firt one will be marked, irrepective of which one i correct. If two anwer are required, only the firt two will be marked, etc. Indien een antwoord of berekening verlang word, maar twee word deur die kandidaat gegee, al leg die eerte een nageien word, ongeag watter een korrek i. Indien twee antwoorde verlang word, al leg die eerte twee nageien word, en. 3.2 For marking purpoe, alternative ymbol (, u, t etc.) will alo be accepted. Vir naiendoeleinde al alternatiewe imbole (, u, t en.) ook aanvaar word. 3.3 Separate compound unit with a multiplication dot, no a full top, for example, m. -1. For marking purpoe, m. -1 and m/ will alo be accepted. Skei aamgetelde eenhede met ʼn vermenigvuldigingpunt en nie met ʼn punt nie, byvoorbeeld m. -1. Vir naiendoeleinde al m. -1 en m/ ook aanvaar word. 4. POSITIVE MARKING/POSITIEWE NASIEN Poitive marking regarding calculation will be followed in the following cae: Poitiewe naien met betrekking tot berekeninge al in die volgende gevalle geld: 4.1 Subquetion to ubquetion: When a certain variable i calculated in one ubquetion (e.g. 3.1) and need to be ubtituted in another (3.2 of 3.3), e.g. if the anwer for 3.1 i incorrect and i ubtituted correctly in 3.2 or 3.3, full mark are to be awarded for the ubequent ubquetion. Subvraag na ubvraag: Wanneer ʼn ekere veranderlike in een ubvraag (bv. 3.1) bereken word en dan in ʼn ander vervang moet word (3.2 of 3.3), bv. indien die antwoord vir 3.1 verkeerd i en word korrek in 3.2 of 3.3 vervang, word volpunte vir die daaropvolgende ubvraag toegeken. 4.2 A multitep quetion in a ubquetion: If the candidate ha to calculate, for example, current in die firt tep and get it wrong due to a ubtitution error, the mark for the ubtitution and the final anwer will be forfeited. ʼn Vraag met veelvuldige tappe in ʼn ubvraag: Indien ʼn kandidaat bv. die troom verkeerd bereken in ʼn eerte tap a gevolg van ʼn ubtituiefout, verloor die kandidaat die punt vir die ubtituie owel a die finale antwoord. 5. NEGATIVE MARKING/NEGATIEWE NASIEN Normally an incorrect anwer cannot be correctly motivated if baed on a conceptual mitake. If the candidate i therefore required to motivate in QUESTION 3.2 the anwer given in QUESTION 3.1, and 3.1 i incorrect, no mark can be awarded for QUESTION 3.2. However, if the anwer for e.g. 3.1 i baed on a calculation, the motivation for the incorrect anwer could be conidered. ʼn Verkeerde antwoord, indien dit op ʼn konepuele fout gebaeer i, kan normaalweg nie korrek gemotiveer word nie. Indien ʼn kandidaat gevra word om in VRAAG 3.2 die antwoord op VRAAG 3.1 te motiveer en 3.1 i verkeerd, kan geen punte vir VRAAG 3.2 toegeken word nie. Indien die antwoord op bv. 3.1 egter op ʼn berekening gebaeer i, kan die motivering vir die verkeerde antwoord in 3.2 oorweeg word. Kopiereg voorbehou Blaai om aeblief

5 (EC/JUNIE 2017) FISIESE WETENSKAPPE V1 5 QUESTION/VRAAG D (2) 1.2 B (2) 1.3 A (2) 1.4 B (2) 1.5 A (2) 1.6 A (2) 1.7 B (2) 1.8 C (2) 1.9 A (2) 1.10 A (2) [20] QUESTION/VRAAG It i called a projectile/dit word ʼn projektiel genoem (1) OPTION/OPSIE 1 Data: vi = 15 m -1, g = - 9,8 m -2 hmax =? vf = 0 m. -1 at max height (by mak hoogte) (Let downward be negative) (Laat afwaart negatief wee) vf 2 = vi 2 + 2gΔy 0 2 = (15) 2 + 2(-9,8)( Δy) 19,6Δy = 225 Δy = hmax = 11,48 m OPTION/OPSIE 2 [for upward motion] [vir opwaarte beweging] vf = vi + g Δt 0 = 15 + ( 9,8) Δt Δt = 15 9,8 = 1,53 Δy = viδt gδt2 =(15)(1,53)+ 1 2 ( 9,8)(1,53)2 Δy = hmax = 11,48 m OPTION/OPSIE 3 vf = vi + g Δt 0 = 15 + ( 9,8) Δt Δt = 15 9,8 = 1.53 Δy = v f + v i Δt = 1,53 2 Δy = hmax = 11,48 m (4) Copyright reerved Pleae turn over

6 6 PHYSICAL SCIENCES P1 (EC/JUNE 2017) OPTION/OPSIE 1 OPTION/OPSIE 2 Δt =? vf = vi + g Δt [for upward motion] [vir opwaarte beweging] Δy = viδt gδt2 0 = 15 + ( 9,8) Δt 0 = 15Δt (-9,8)Δt2 Δt = 15 = 9,8 1,53-9,8 Δt Δt = 0 -Δt(9,8Δt 30) = 0 total time / totale tyd = 2(1,53) Δt = 30 = 3,06 9,8 Δt = 3,06 (3) Δy = 8 m Δt =? Δy = vi Δt gδt2 8 = 15 Δt (-9,8)Δt2 4,9 Δt 2-15 Δt + 8 = 0 Uing a quadratic formula to find the root: Gebruik ʼn kwadratiee formule of die wortel te bereken: Δt = b± b2 4ac 2a = ( 15)± ( 15)2 4(4,9)(8) = 2(4,9) 15 ± ,8 9,8 15 ±8,26 = 9,8 Δt = 2,37 or Δt = 0,69 Both value of Δt are acceptable/albei waarde vir Δt aanvaarbaar (5) Kopiereg voorbehou Blaai om aeblief

7 (EC/JUNIE 2017) FISIESE WETENSKAPPE V Poition v time graph / Poiie v tyd grafiek Both axe labelled /Albei ae met bykrifte All point plotted a directed/ Alle punte geplot oo gevra Correct hape NOTE: Take away a mark if not all point are plotted : For the maximum height accept y value = m or 11.5 m on the graph AANDAG: Neem 1 punt weg indien nie alle punte geplot nie. : Vir die makimum hoogte, aanvaar y = 11,48 of 11,5 m op die grafiek. 2.2 OPTION/OPSIE 1 (Take downward a poitive) (Afwaart poitief) Stone/Klip 1: Δy1 = vi Δt gδt2 = 0 Δt (9,8)Δt2 For both Δy1 = 4,9 Δt 2 {For Δt = t} Δy1 = 4,9 t 2 Stone/Klip 2: Δy2 = vi Δt gδt2 t () = 30 Δt (9,8)Δt2 {Δt =t 2} Δy2 = 30(t 2) + 4,9(t 2) 2 But / maar Δy1 = Δy2, 4,9 t 2 = 30(t 2) + 4,9(t 2) 2 10,4t = 40,4 t = 3,89 For econd tone / Vir tweede klip t 2 = 3,89 2 = 1,89 OPTION/OPSIE 2 (Take downward a poitive) (Afwaart poitief) Stone/Klip 1: Δy1 = vi Δt gδt2 = 0 Δt (9,8)Δt2 Δy1 = 4,9 Δt 2 {For Δt = t + 2} Δy1 = 4,9 (t + 2) 2 Stone/Klip 2: (4) Δy2 = vi Δt + 1 For both 2 gδt2 /Vir beide = 30 Δt (9,8)Δt2 {Δt = t} Δy2 = 30(t) + 4,9(t) 2 But / maar Δy1 = Δy2, 4,9 (t + 2) 2 = 30(t) + 4,9(t) 2 10,4t = 19,6 t = 1,89 For econd tone / Vir tweede klip 1,89 (6) [23] Copyright reerved Pleae turn over

8 8 PHYSICAL SCIENCES P1 (EC/JUNE 2017) QUESTION/VRAAG Impule i the product of the net force acting on an object and the time the net force act on the object. OR It i a meaure of how hard and for how long doe a net force act on an object Impul i die produk van die netto krag wat op ʼn voorwerp inwerk en die tyd wat die netto krag op die voorwerp inwerk. OF Dit i die maattaf vir hoe hard en vir hoe lank ʼn netto krag op ʼn voorwerp inwerk. (2) OPTION/OPSIE 1 Fnet Δt = m Δv = 0,045(45 0) = 2,03 N Fnet = m Δv Δt OPTION/OPSIE 2 Impule = Change in momentum Impul = verandering in momentum Δp = mδv = 0,045(45 0) = 2,03 kgm -1 Impule / Impul = 2,03 N (3) 2,03 = 3, = 580 N (2) Take direction toward the wall a poitive/ Neem rigting na die muur a poitief m = 60 g = 0,060 kg vi = 12 m -1 vf = -10 m -1 Δp =? Δp = m(vf vi) = 0,060 (-10 12) = -1,32 kg m -1 Δp = 1,32 kg m -1 away from the wall/weg vanaf die muur (5) ,32 N or/of 1,32 kg m -1 (1) Kopiereg voorbehou Blaai om aeblief

9 (EC/JUNIE 2017) FISIESE WETENSKAPPE V The total linear momentum of an iolated ytem remain contant / i conerved. OR/OF The total linear momentum of an iolated ytem before colliion i equal to the total linear momentum after colliion. Die totale lineêre momentum van ʼn gelote iteem bly kontant / bly behoue OF Die totale lineêre momentum van ʼn gelote iteem voor ʼn boting i gelyk aan die totale liniêre momentum na die boting (2) There i a need to calculate the velocity of block m jut before colliion/bereken die nelheid van blok m voor die boting: Em top/bo = Em bottom/onder (EP + EK) top/bo = (EP + EK) bottom/onder mgh + 0 = mv2 2gh = v 2 v = 2gh = 2(9,8)(3,6) = 8,40 m -1 m1v1i + m2v2i = m1v1f + m2v2f 2,2 8, = 2, v2f v2f = 2,64 m -1 (6) [21] Copyright reerved Pleae turn over

10 10 PHYSICAL SCIENCES P1 (EC/JUNE 2017) QUESTION/VRAAG OPTION/OPSIE 1 OPTION/OPSIE 2 Ff FN Ff FN Fg FG F g Fg// Fg FN Ff Fg// = mg Sin θ Both component (F g// and F g ) Albei komponente (F g// en F g ) FN Ff (3) Fg = - mg Co θ (oppoite direction of FN)/ (teenoorgetelde rigting a FN) Applying Newton Second law for the motion parallel to the lope: Toepaing van Newton e Tweede Wet van die beweging parallel aan die kuinvlak: Fg// + Ff = ma mg Sin θ - µkfn = ma.. (1) for one of the two/ vir een van die twee Applying Newton Second law for the motion perpendicular to the lope/toepaing van Newton e Tweede Wet van die beweging loodreg aan die kuinvlak:: FN + FG = ma FN mg Co θ = ma. (2) (Since there i no motion perpendicular to the lope a = 0 m. -2 ) (Geen beweging loodreg aan kuinvlak du a = 0 m. -2 ) FN = mg Co θ (Subtitute/Vervang FN in (1)) mg Sin θ - µk(mg Co θ) = ma (dividing by m) g Sin θ - µk(g Co θ) = a (Subtitute/Vervang µk = 0,10, g = 9,8 m -2 and/en θ = 30 ) 9,8 Sin30 0,10 9,8 Co30 = a a = 4,00 m vf = vi + aδt = = 16 m -1 (5) (3) Kopiereg voorbehou Blaai om aeblief

11 (EC/JUNIE 2017) FISIESE WETENSKAPPE V When a net force/reultant force act on an object, it produce the acceleration of the object in the direction of the net force/reultant force. Thi acceleration i directly proportional to the net/reultant force and inverely proportional to the ma of the object. Indien ʼn netto krag op ʼn voorwerp inwerk, vernel die voorwerp in die rigting van die netto krag. Die vernelling i direk eweredig aan die netto krag en omgekeerd eweredig aan die maa van die voorwerp. (2) Take down ward a negative/afwaart a negatief For the Elevator/Vir die hybak Fnet = FT meg = meae = - mea (ae = - a) FT meg = - mea (1) For the counterweight/vir die teengewig Fnet = FT mcg = mcac = mca (ae = a) FT mcg = mca (2) (2) (1) : meg - mcg = mea + mca g(me - mc) = a(me + mc) a = g(m E m C ) (m E + m C ) 9,8( ) ( ) OR/OF OPTION/OPSIE 1 For the counterweight FT mcg = mca FT 1000(9,8) = 1000(0,68) FT = N 9,8( ) = a( ) 1470 = 2 150a = a = 0,68 m -2 = 0,68 m -2 (6) OPTION/OPSIE 2 For the Elevator FT meg = -mea FT 1150(9,8) = -1150(0,68) FT = N (3) [22] Copyright reerved Pleae turn over

12 12 PHYSICAL SCIENCES P1 (EC/JUNE 2017) QUESTION/VRAAG W = FΔxCoθ = Co0 = = J Wf = Ff ΔxCoθ = 50 6 Co180 = = J OPTION/OPSIE 1 {Poitive marking from/ Merk poitief vanaf 5.2.1} OPTION/OPSIE 2 {Poitive marking from/ Merk poitief vanaf 5.2.1} (3) (3) Wnet = Wf + WHC = Ff ΔxCoθ + FappΔxCoФ = Co 60 = = 600 J Fnet = Ff + FappCo 60 = ,5 = 100 N Wnet = Fnet Δ Coθ = = 600 J (4) The net work done on an object i equal to the change in the kinetic energy of the object. OR The amount of work done by a net force on object i equal to the change in the object kinetic energy. Die netto arbeid op ʼn voorwerp verrig i gelyk aan die verandering in kinetiee energie van die voorwerp. OF Die hoeveelheid arbeid verrig deur ʼn netto krag op ʼn voorwerp i gelyk aan die verandering in die voorwerp e kinetiee energie (2) Wnet = ΔEK Wf = EKf - EKf Ff ΔxCoθ = 1 2 mvf2-1 2 mvi (Δx)Co 180 = 1 2 (800)(0) (800)(20,5)2 for any of the 2/ vir enige van die Δx = The braking ditance/ Remaftand = Δx = 28,02 m (5) Kopiereg voorbehou Blaai om aeblief

13 (EC/JUNIE 2017) FISIESE WETENSKAPPE V Wnet = ΔEK = 1 2 m(vf2 - vi 2 ) = 1 2 (80)( ) = 40(625) = J = 25 kj (3) fk = µkfn = 0,34(mg Coθ) = 0, , ,20 = 242,13 N (4) FN FN F app/toeg Fapp/toeg Fg OPTION/OPSIE 1 Wnet = WApp + W// + Wf = FappΔxCoθ + FG//ΔxCoФ + FfΔxCoФ = FappΔxCoθ + mgsinδδxcoф + FfΔxCoФ = 450 1,2 Co , ,2Co ,13 1,2 Co = 450 1, ,8 0,5 1, ,13 1,2-1 = ,56 Wnet = - 142,56 J OPTION/OPSIE 2 Fg// 1,2 Fnet = Fapp + Fg// + Ff = Fapp + mgsinδ+ Ff = 450 (80 9,8 0,5 1, ,13) = - 118,80 N Wnet = FnetΔ Coθ = 118,80 1,2-1 for any of the two vir enige van die twee Fg = -142,56 J (4) EP = mgh = 80 9,8 0,5 = 392 J (3) [35] (4) Copyright reerved Pleae turn over

14 14 PHYSICAL SCIENCES P1 (EC/JUNE 2017) QUESTION/VRAAG Doppler effect i the change in frequency (or pitch) of the ound detected by a litener, becaue the ound ource and the litener have different velocitie relative to the medium of ound propagation. OR Doppler effect i the apparent change in frequency of a wavewhen there i relative motion between the ource and an oberver. OR Doppler Effect i an (apparent) change in oberved/detected frequency (pitch), (wavelength) a a reult of the relative motion between a ource and an oberver (litener). Die Doppler effek i die verandering in frekwenie (of toonhoogte) van die klank waargeneem deur ʼn luiteraar want dit klankbron en luiteraar het verkillende nelhede relatief tot die medium van die voortplanting van die klank. OF Die Doppler effek i die kynbare verandering in die frekwenie van ʼn golf a daar relatiewe beweging i tuen die bron en die waarnemer. OF Die Doppler effek i ʼn waarkynlike verandering in die waargenome frekwenie (toonhoogte)(golflengte) a gevolg van die relatiewe beweging tuen die bron en die luiteraar (2) Toward the Litener. (Na die luiteraar) The frequency of the ound wave heard by the litener i greater than the frequency of the ound wave emitted by the ambulance. The compreion in front of the ource are cloer together becaue the ource i moving toward the previouly emitted wavefront when the next wavefront i ent reulting in a decreae in wavelength and a ound of higher pitch i heard. Die frekwenie van die klankgolwe gehoor deur die luiteraar i hoër a die frekwenie van die klankgolwe uitgetraal deur die ambulan. Die amepering aan die voorkant van die bron i nader aanmekaar want die bron beweeg na die uitgetraalde golffront wanneer die vorige golffront getuur word en verooraak ʼn afname in die golflengte en die hoër toonhoogte word gehoor. (4) v vl fl f v v v v v = 42,5 m -1 (4) Kopiereg voorbehou Blaai om aeblief

15 (EC/JUNIE 2017) FISIESE WETENSKAPPE V v vl f L f v v When the car approache/ Soo die motor naderbeweeg: 450 f v 450( v ) f When the car move away/ Soo die motor weg beweeg: 390 f v 390( v ) f 450(v) 390( v ) = OPTION/OPSIE 1 450( v ) f 450( 24,5) f f = 417,86 Hz v = v v for either of the two/ vir enige van die twee = 24,5 m -1 (7) OPTION/OPSIE 2 390( v ) f 390( 24,5) f f = 417,86 Hz (3) [20] Copyright reerved Pleae turn over

16 16 PHYSICAL SCIENCES P1 (EC/JUNE 2017) QUESTION/VRAAG The magnitude of the electrotatic force exerted by one point charge (Q 1 ) on another point charge (Q 2 ) i directly proportional to the product of the charge and inverely proportional to the quare of the ditance (r) between them. OR The magnitude of the electrotatic force between two point charge i directly proportional to the product of the magnitude of the charge and inverely proportional to the quare of the ditance between them. Die grootte van die elektrotatiee krag wat deur een puntlading (Q1) op ʼn ander puntlading (Q2) uitoefen, i direk eweredig aan die grootte van die produk van die lading en omgekeerd eweredig aan die kwadraat van die aftand tuen hulle. OF Die grootte van die elektrotatiee krag tuen twee puntlading i direk eweredig aan die produk van die maa van die lading en omgekeerd eweredig aan die kwadraat van die aftand tuen hulle. (2) Electrotatic force exerted by Q1 on Q2/ Elektrotatiee krag uitgeoefen deur Q1 op Q2: F = k Q 1Q 2 r 2 = (9 109 )( )( ) 0,04 2 = 4, N, to the Eat/na die Oote Electrotatic force exerted on Q2 by Q3/Elektrotatiee krag uitgeoefen deur Q2 op Q3: F = k Q 2Q 3 r 2 = (9 109 )( )( ) 0,06 2 = 3, N, to the Eat Both force are toward the ame direction/ Albei kragte i in dieelfde rigting: The net electrotatic force/ Die netto elektrotatiee krag Fnet = 4, N + 3, N = 7, N (To the Eat) (7) [9] TOTAL/TOTAAL: 150 Kopiereg voorbehou Blaai om aeblief

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