UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONSInternational General Certificate of Secondary Education

CANDIDATENAME ___ H_~_A-tv._$~ 1

ITIIJCENTRENUMBER

CANDIDATENUMBER

PHYSICS

Paper 3 Extended

0625/31

OctoberlNovember 2013

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials are required.

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen.You may use a pencil for any diagrams or graphs.Do not use staples, paper clips, highlighters, glue or correction fluid.DO NOT WRITE IN ANY BARCODES.

Answer all questions.Electronic calculators may be used.You may lose marks if you do not show your working or if you do not use appropriate units.Take the weight of 1kg to be 10 N (l.e, acceleration of free fall = 10m / S2).

At the end of the examination, fasten all your work securely together.The number of marks is given in brackets [ 1 at the end of each question or part question.

DC (NF/SW) 6516216© UCLES 2013

This document consists of 20 printed pages.

~ UNIVERSITY of CAMBRIDGE~ International Examinations [Turn over

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1 (a) State Hooke's law. For

..............ZXh'MSl9.D ..S&o...?:v0"j !?.. ciJmJ-JJ ..pm~».n~ "';::"

...............12. ~ eo.aJ...~p.ll'e.J ~ F= k.:x ~ [1]

(b) Fig. 1.1 shows a graph of the stretching force F acting on a spring against the extensionx of the spring.

FIN

(i) State the features of the graph that show that the spring obeys Hooke's law.

........:ffi~..g.~1 .ls Q SmBkt..E.Df:····Q!2£1···fU·~~fJj.

........-ttv:m"(jh ..~ ..C)tttr ..n :...w.I.~ am~:hwt: ~&:e.~1.~ [1]

\ 00 tV.:= 25 oc N/rn0.40 m

k= Q.~.5 Njt:nm [3]

150

---50

0__ -o 10 20 30 40 50 60 70 80

xlmm

Fig. 1.1

(ii) Calculate k, the force per unit extension of the spring.

k:::: £ zx: 100 "'r _50 __ C) Ie.X L.o v.2.0 -c:::.:::J

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(iii) The limit of proportionality of the spring is reached at an extension of 50 mm.

Continue the graph in Fig. 1.1 to suggest how the spring behaves when thestretching force is increased to values above 125N. [1]

(iv) Another spring has a smaller value of k. This spring obeys Hooke's law forextensions up to 80 mm.

On the grid of Fig. 1.1, draw a possible line of the variation of F with x for thisspring. [1]

[Total: 7]

k W\Wf>< ~ "" an c Sltxpe. 0" 8'ac4..d<::,0 ~e~<; ~ SlY\.cJl£.v- ~~'ed

© UCLES 2013 [Turn over

ForExaminer's

Use

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2 A train has a total mass of 7.5 x 105 kg. ForExaminer's

Use(a) The train accelerates from ~ at a constant rate along a straight, horizontal track.It reaches a speed of 24 m/ s in 60 s.

Calculate

(i) the train's acceleration,

0= 24-0 .60

Zq-b'o

acceleration = O.~h r.nls~ [2]

(ii) the resultant force acting on the train.

~~ mO7. s x 105 'f 0,~o300 ocx:>f\j

_ 300 OOO~force - [2]

(b) The train now travels with a constant speed of 24m/s along a straight, horizontal track.The total force opposing the motion due to ~_ and air resistance is 7.2 x 104 N.

tpowers:: W -, F)( c(t t

7,2)( IQt, X 2l(

\

c\ ..'7- XIO Wpower = [2]

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(ii) The train begins to travel up a slope.

Explain why the power of the train's engine must be increased to maintain thespeed of 24m/s .

.............~v.)TIch\;>nJ.....~-\en:h~ £~ ..&f...it.-a.\~~ .

..............t: ~ io.cv::€-.~.d. .

...............fOr...~ ..~1Cl.t dlsf.uY1G. C{).oveJ m.o~ .W-9..(K d.9..~h-9? ~ 1).QNf tY.l tia. ..5a.~ ..tJ.~ .

.......~.~b Y.Ylli!I/l.S (+ ~ NDf2E rouJQ.C [3]

[Total: 9]

ForExaminer's

Use

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3 (a) (i) Write down the names of three man-made devices in everyday use that depend,for their action, upon the m_omentsof forces....., --

1 ~ ..?I9.~.s ~ .

2 iD..p ~ .3 S~.1.).().OC ~........ C?J .

[2]

(ii) Fig. 3.1 shows a uniform rod AS acted upon by three equal forces F.

F

A'=========;:::========IS

F

F

ForExaminer's

Use

State two reasons why the rod is not in equilibrium.--~1 ~f.'Ca. L .1.111..dP·pQ;~+e..dt~cb\xl$...(Jre.o.6t.e.~~~,(~MQre~.~ d~t0~2 1JkY-<=. ..Is 9. ~.S~ 01..Dp:1.er.cl .

(Y'C -\,tV ~-yr1e~ f1 f)ot ~ucJ. -to [2]

Q~tc.~

Fig. 3.1

..

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(b) Fig. 3.2 shows a uniform rod PO, supported at its centre and held in a horizontal position.The length of PO is 1.00 m.

I,. 1.00m I.,I 0.30m II • • i

I I

s

ForExaminer's

Use

[Turn over

P~----~--~--~---=~~----~12N

Fig. 3.2

A force of 12 N acts at a distance of 0.30 m from the support. A spring S, fixed at itslower end, is attached to the rod at O.

(i) Calculate the force exerted on PO by the spring.

anti C- 'vJ (6)otre~ =12 x 0.'3

F

force = 7.~.4. N [2]

(ii) Explain why it is not necessary to know the weight of PO.

..........~.~:9··~t.····~q>.·····Y.\.9····:mo.med919..J Ce~ ar. .

............r.:nd ../ho.s nD. per.fX?:adAG.QC!r.; cl;.s.mn~ [1]

&m ~ c1{bd [Total: 7]

csrCM:ujht CAck at Ce"-jy,,.afl"'oJ( plwlt( Ce~ :f

..

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4

\t -4, t('(a) State the energy changes, that take place when For

Examiner'sUse(i) a cyclist rides down a hill without pedalling,

.....Gm~ p.pt.~o.J ~ f.®. Ki.nJ.r.~..~ .

. .-t~ ..0..Q,(.k-..d.o~ ~.a.J\I.tt ~ ..\Cd'.Js~~fJ..... ..~£i®.~~(ii) a cyclist pedals up a hill at a constant speed .

.......ck.rn.I.c& ~ fu gm!f;tat&m2 pot~~ (I)

C1eMi.~ ..~ ..~ ...tkt~·~~··t9·····9·raif.:tNJ..fb.1..&.C~~ [3]

(b) A car of mass 940 kg is travelling at 16 m / s.

(i) Calculate the kinetic energy of the car.

~ rnvL

2ChS X ql(O}( \6\,2 X lOC;

Skinetic energy = 1~.2..x...\.D :J. [2]

(ii) The car is brought to rest by applying the brakes.

The total mass of the brakes is 4.5 kg. The average specific heat capacity of thebrake material is 520 J / (kg "C),

Calculate the rise in temperature of the brakes. Assume there is no loss of thermalenergy from the brakes.

Q=rnc 6T

t:;\.:= CQ -\'Y) C .

-:z 51

o. . 51 C

rise In temperature = [3]

[Total: 8]

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Explain why this does not happen .

....................~~du:d1~ ta.~ ..ph~ ~~ ~~.c ..o. .

.....................~ ~'Q.LD.oc ~.s.~ :bt.4...~~.w.s..±0 .

.......................~.~~ ..~,r.~~ [2]

[Total: 6][Turn over

9

5 One side of a copper sheet is highly polished and the other side is painted matt black.

The copper sheet is very hot and placed in a vertical position, as shown as in Fig. 5.1.

left hand right hand

ForExaminer's

Use

copper sheet

matt black side polished side

Fig. 5.1

A student places her hands at equal distances from the sheet, as shown in Fig. 5.1.

(a) Explain

(i) why her hands are not heated by convection,

bec. bed.t~~GAr. rises 0.p. ..................................f.).~t...s.},~w~.1." ~ ..kt.ds [1]

(ii) why her hands are not heated by conduction .

.kc- fu OJ'Y. b.itween p.fo.ft CMd ...h.~.nc1. r~..~ .

...... p.\S}o.r.. Ce:n~.doc oR. y [1]

(b) State and explain which hand gets hotter .

.................~:P.+ hQ(.)d f.b:9~ ...~!rlf...h.I.<t\;.l51d!.~...b\l1tEr....................bee mait bJa.Gkn £.l~ ..~ Ct b.e.trer. eJm.dter.- ......................~.beat tmn ..~h1!Y.sfdr2. [21

(c) It is suggested that one side of the copper sheet cools to a lower temperature than theother side.

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6 (a) Complete the following statements by writing appropriate words in the spaces.

An increase in the temperature of the gas increases the pressure because the

.........£ped of the m~1.e~ increases.

The force on the wall due to the gas is the pressure multiplied by the ...su.cfh& ..Q.;

ForExaminer's

UseThe pressure of a gas in a sealed container is caused by the collisions of

.....rn(9.l.ec~> .....with the container wall.

of the wall. ( [2])(b) A mountaineer takes a plastic bottle containing some water to the top of a mountain.

He removes the cap from the bottle, drinks all the water and then replaces the cap, asshown in Fig. 6.1.

On returning to the base of the mountain, he finds that the bottle has collapsed to amuch smaller volume, as shown in Fig. 6.2.

l

c oJ

Fig. 6.1~Fig. 6.2

(i) Explain why the bottle collapsed .

.........~~:.1 ..W...F~ ?.~.e.d ...o.n ...cJ.-...±DP. ...Cbf. ... I2f)~£.lntC14.l,

........... p.Y"£5.5. ~ ~ ..Qt.. GAY.; ... i.D ~11:k ..:::: ~ ..L(}W..·r·te.~.o~..d.

............ ~ O-.\c M5.:\d& w.~.G.b.. t.5. .less. fun .

..............p.r.e.s.s..Y..~~ ~m ~.mo~.bk"h [2]bJitlL Cv/fcxps-es ~ pre~s~~ ou1s,~dstbdi·lL is. e=»: tfttun pre-S"su.~ (h5.,ck..

(f vi V© UCLES 2013 0625/31/0/N/13

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(ii) At the top of the mountain the atmospheric pressure was 4.8 x 104 Pa and thevolume of the bottle was 250 ern".

Calculate the volume of the bottle at the base of the mountain where the pressureof the air inside the bottle is 9.2 x 104 Pa. Assume no change of temperature.

B03le5 WvW'R \/( s:

q. 2x- Ie/of K v ~V=-

© UCLES 2013

rpu ==- Cvns.1an1

~VL,;-,~ X lOt, X' 2.50

130volume = ..\..~.O Dm~ [3]

[Total: 7]

"

ForExaminer's

Use

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7 (a) Fig. 7.1 shows the surface of water in a tank.

barrier

Fig. 7.1

Straight wavefronts are produced at the left-hand end of the tank and travel towards agap in a barrier. Curved wavefronts travel away from the gap.

(i) Name the process that causes the wavefronts to spread out at the gap.

..............................~r~.(Qc):i~~J [1]

(ii) Suggest a cause of the reduced spacing of the wavefronts to the right of the barrier .

...hl:O':'fe$. tr.-a.~ s.lt:).\..J.eK: / W:-atec (~ .s.hcd(.o.wer.: [1]

(iii) State how the pattern of wavefronts to the right of the barrier changes when thegap is made narrower .

........Qt)3J,Cl.c s.'P.r:ea.d ~ W-~t.L ..J.nc~ [1]

(:) •• Q~ t1hJo ~ Vvo.J.,fCS \ So 2rYtq,t(e,,r-

..

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Use

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(b) Fig. 7.2 shows a wave travelling, in the direction of the arrow, along a rope. ForExaminer's

Use

,,II

2.4m

~. :beSt- ~ DJ T-I) QS l.vt::

Fig. 7.2 vv~bo~ go ~not.~r cu:.j -to ~ v,J

(i) Explain why the wave shown in Fig. 7.2 is described as a transverse wave. <{ f.. b 2..

__ '$ ------7- ..... ClscJ.lJcdioo...(')tn~ ..h ...\.If.?.@.'ll.J...d D!.JIl .. o.t..nab+. 1i t'(>/rll~dOWn Q+...(J..)..:ib ..~ dJr.edhld. ~ wa.~ [1]

(ii) The speed of the wave along the rope is 3.2 m/s.

Calculate the frequency of the wave.

''"\ = 2.~ z: \''2 m2

frequency = ::?~.I H.~ [3]

[Total: 7]

2\~-3.2f = 2. )( 3.2/2. ~

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8 (a) Describe an experiment that shows how a magnet can be used to produce a current ina solenoid by electromagnetic induction. Sketch and label the arrangement of apparatusyou would use.

ForExaminer's

Use

magnet

»: ::::-.;

mA-=

~-:::::

solenoid

...ho.~d a. M~.nJ...Cl.bo.~ a SD l~DQ lJ..0.:<:: l.(\$.icla) ..whi.d ..r.~ .

......~.n~d ....t.o...9: ..ce()h.:-;-:.z~ ...fXli.IJ.\.::O.mf.l)~~.....o/.'...~a1.vanDrr:-ater-

.......t0D.ft. ...~ ..~.~ ..ihrn~.k ....Hu..Snle.no.td.'- ...Cor:..mo.~..)o{.;.·a:m!1O

(b) Fig.8.1 represents a transformer with primary coil P and secondary coil S, wound on aniron core.

There is an alternating current in coil P.

iron core

P

Fig. 8.1

(i) State what happens in the iron core as a result of the alternating current in P.

4IbrrLet-~ fX)~.~.A~Ld i~ Ch4.~~ (.r.e~:r.Y.Jj) ................... l~ ~ rr..ern ~.~ [2]

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(ii) Tick the box next to the correct description of the current in S.

0 higher frequency a.c.

[a same frequency a.c.

0 lower frequency a.c.

0 rectified d.c.

0 constant d.c. [1]

(iii) Coil P has 50 turns of wire, an applied voltage of 12V, and a current of O.SOA.Coil S has 200 turns.

Calculate the current in S. Assume the transformer is 100 % efficient.

Vc; N$--Vp NO'VS _ 200

-::;> Vs = 42V- ---1'2. 50Vs Is':=:' Vt'L fi:Z?J( Is zs, 1'2 ~ O.S-

1. S..,. 12K OS: _ (:). \ 2 A-L...g current - [3]

[Total: 9]

ForExaminer's

Use

"

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9 (a) State the relationship between

(i) the resistance R and the length L of a wire of constant cross-sectional area,

.......:P..f?!.. .. l cli~ ~ .(ii) the resistance R and the cross-sectional area A of a wire of constant length .

......1<a( ~ .!.n~ p"'fDdIuno.Q [;i

(b) A 60W filament lamp X is connected to a 230V supply, as shown in Fig. 9.1.

230V

ForExaminer's

Use

X

Fig. 9.1

Calculate the current in the filament.

T ::~V

60 W210 V

0.26

current = O..~.2.6. f.t. [2]

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(c) Lamp Y has a filament made of the same metal as the filament of lamp X in (b).

This filament has half the length and one-third of the cross-sectional area of the filamentof X.

Lamp Y is also connected to a 230V supply.

Calculate the ratio current in filament of Y. Show your working.current in filament of X

y )(~tt; L 2.Lfku A ']A

S~rn~ mde.r,c:.Q J; = ~

1<~fu =- tQx Ax __:'> 'Q~;{_Rx"3Ly Lx - )L - 2~

kJ :;:-; "Rx -.-->-,. T 0( ~

Ij = t I~ l"y 2ratio = __ ~ _ [4]

lx 3[Total: 7]

Or ~ sJo~~1ufv--

Ix = CJ"\26A

Sj =- O.I~ AI~ _ ().l~ A---- -".1)< C5 .L.b ft

ForExaminer's

Use

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10 (a) Fig. 10.1 shows an electron beam travelling, in a vacuum, towards the space between apair of oppositely-charged parallel plates.

+ + + + +

electronbeam

Fig. 10.1

On Fig. 10.1, draw carefully the path of the beam between the plates and in the spaceto the right of the plates. [2]

(b) The screen of a cathode-ray oscilloscope (c.r.o.) has a grid of 1 cm squares. Fig. 10.2shows the trace of an alternating voltage on this screen.

,1 ern-, ,

Fig. 10.2

(i) A potential difference of 5.0V across the Y-plates of the oscilloscope moves thespot on the screen a vertical distance of 1.0cm.

Use Fig. 10.2 to determine the maximum p.d. across the Y-plates.

I c.m .:::: SAC) V

,sc.xn _ ? V\

l1~O'--"-f·S V)maximum p.d. = 7.':.9. V [1]

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ForExaminer's

Use

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19

(ii) The spot on the screen takes 1.0 ms to move 1.0 cm horizontally.

From Fig. 10.2, determine the time for 1 cycle of the waveform on the screen, anduse this time to find the frequency of the alternating voltage.

Qj.&tL s=: ~ Ctn z: 4- in S\--...-T

\ 250

ForExaminer's

Use

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frequency = 2.5Q H.~ [3]

[Total: 6]

Hany El-Gezawy

ForExaminer's

Use

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Everyreasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, thepublisher will be pleased to make amends at the earliest possible opportunity.

University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University ofCambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

20

11 (a) Describe the action of

(i) a NOT gate,

, lXlrJ J:}..QJ.-~d.O t iJClPd- 07.out?ut ..1 [1]~ in()vt (5tatd

a thermistor. '

..................a.S.1s:mn.(n. ..cha.n.ifs.(d.ec.)..qs; ..~ ..9dJ~ ...011{;/ [1]

(ii)

(b) Fig. 11.1 shows a circuit that switches on a warning lamp when the temperature in anoven falls below a set value.

-.-II

Fig.11.1

Explain, with reference to the components in the circuit and point P,

(i) why the warning lamp is on when the temperature in the oven is below the set value,

........Ott ...L~.We.r. i:e..t.n~.~ ....re.s:.f.(;\~¥)~...~ ...~sJ:b.r.: ..

....... J>.... hI~.h. ; ....p..cI ...Q.c;roo.<.( ..:i:l:tw.n'..>.k::.rs.. .b.IEfhSO .

.............v:.Q.\ ~ I0.P.LJ. ..±Q. e= !.r..L.£)w .

............0~pJ.-···TI···/jatLC hjk ~ ..W.O"'\lll~ .

···..··..·..~9~t1.s:. 0.W .

............................................................................................................................. [4]

(ii) the effect of changing the resistance of R.

........c.hqh.ff.$. ....r;g ~.~~ /s.el-:..vaJ~ ot w.?:v..~.....

..........~ ~f ~.r::rJ1(. Qf.\ [1]

[Total: 7]

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