Phy3prac Jan2008 Group 2a

(Jther names

Surname Centle No.

PaperReference

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Edexcel GGE Physics AdvancedSubsidiarv Unit TestPHY3 PracticalTest

Fridav11Januarv2008- Afternoon

For lhe SuDervisor'suse Tick if either circuitset up for candidate (Give details below)

Question numDers

Time: I hour 30 minutes

Comments

Instructionsto Candidates In the boxes above, write your centre number,candidatenumber,your surname,othernamesand signature. PHY3 consists of questions A and B. Each question is allowed 35 minutesplus 5 minuteswriting-uptime. There is a further10 minutes for writing-upat the end. The Supervisorwill tell you whichexperiment to attemptfirst. Write all your results,calculationsand answers in the spaces provided in this questionbooklet. you shouldshow all the steps in your working,giving In calculations your answer at each stage.

Information for Candidates The marks for individual questions and the parts of questions are shown in round brackets. The total markfor this paperis 48. The list of data, formulae and relationshipsis printed at the end of this booklet.

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Question A (a) (i)

The apparatusshown in the diagrambelow hasbeen setup for you. Do not move the fixed point or changethe masses.

Wew ,'.:Top

edgeofbench

<,------Pulley Y

pulley X----...---t

a,-------'clamP stand

floor

r

r

Adjust the position of the standsand pulleys until the string leading to the 70 g massand the string leading to the 40 g massare approximatelyat right anglesto each other. Place page 3 of the question paper undemeath the strings. Adjust the position ofthe questionpaperuntil the knot which joins the strings together is verlicallyabovethe point labelledO.

The string leading to the 70 g mass should lie vertically above the line OA and the string leading to the 40 g massshould lie vertically abovethe line OB. .

.

Re-adjustthe apparatusso that all theseconditionsare met. Ensurethat the systemis in stableequilibrium and that all strings lie in the samehorizontal plane. Mark a point C on the page that is vertically below the string that passesto the fixed point.

Remove the questionpaper from beneaththe strings.

(r)

(ii) Draw a line connectingpoint O to point C. Measured, where0: IBOC.

(2)

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THIS QUESTION CONTINUES OVERLEAF

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(iii) Explainhow you ensuredthat: .

the systemwasin stableequilibrium,

all the stringswerein the samehorizontalplane,

theknot wasverticallyabovethe point labelledO,

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friction at the oullev wheels was minimised.

(4) (iv) Assumingthatthe pulleysarefrictionless,calculatethe tensions7r and I: in the stringsOA andOB respectively.

(l)

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On the grid below draw to scale a vector diagram to determinethe resultant Z of these two tensions. Statethe scalethat you are using. Measurethe angle qabetweenthe tension Zz and the resultanttension.

ResultanttensionZ: AflgIe E =

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(b) (i) Measureout 80 cmr of water at room temperaturefrom the beaker and pour the water into the plastic cup. Record the temperaturedr of the water in the cup. D

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Take a heaped spoonful of crushed ice and place it into the cup. Record the final temperatured2 of the water when all the ice has melted. 0,-

Stateanyprecautions thatyou took whencarryingout the experiment.

(3) (ii) Measurethe final volume of water in the plastic cup; hence deducethe volume of the meltedice. Fine I vnlrrme'

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Given that 1.0cml of water or melted ice has a mass of 1.0g write down the initial massrn*.of the water and the massm; of the melted ice.

(1)

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QuestionB (a) Connectthe resistancemeter (ohmmeter)to the light dependentresistor(LDR). Clampthe LDR so that the light detectingface is facing downwardsand is about is shownin Figure1 below. 5 cm abovethe lamp. The arrangement Figure1

reslstancemetef

black card

Set up the circuit containingthe lamp as shownin Figure 2 below. Before you connectthis circuit to the 6V power supply,have your circuits checkedby the Supervisor.You will be alloweda shorttime to correctanyfaults. If you areunable to setup thecircuits,the Supervisor will setthemup for you. Youwill loseonly two marksfor this. Figure 2

(2)

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(b) Connectthe 6.0V outputof the powersupplyto the circuit. Adjustthe heightofthe LDR so thatthe resistance of the LDR is approximatelyI kCl. Whentakingreadings from the meterstry not to casta shadowover the apparatusas this will affectthe readingis fluctuatingestimatean averagevalue reading.lf the resistance resistance R of the LDR. for the reading. Recordthe cunent.1in the lamp and the resistance graph Light intensity I. opposite the conesponding Usethe to determine I _

D _

(3) (c) (i) Disconnectthe power supplyand,without changingthe position of the LDR or lamp, recordthe resistanceof the LDR. Use the graphto determinethe light intensity. This may be thoughtof as the backgroundlight corresponding intensity 'L6u"1*un6. Resistance of LDR lbackFound

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(ii) Calculate the light interrsity Z1u.oat the LDR due to the lamp alone using _ 1 ,

!T| a. m p " :" In a c K q r o u n o .

(iii) Assuming that the output voltage of the power supply is 6.0 V, useyour value for l from part (b) to calculatethe electrical power P suppliedto the lamp.

(4) (d) Without changing the position of the LDR or lamp connectthe 4.5 V output of the power supply to the circuit. Record new values for 1, R andL.

D

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remainsthe same,calculatethe new value of 16,oo. Assuming that Z6u"loouoa

Calculatethe new value ofP assumingthat the output voltage of the power supply is 4.5V.

tf,) (e) A studentsuggeststhat Zqu.ois directly proportional to P (i) Write an equationto representthis direct proportionality.

(ii) Use your two sets of data to determinetwo values for the constantof proportionalityk

(iii) Calculatethe percentagedifferencebetweenyour two values of ft and comment on whether this percentagedifferencesupportsthe student'ssuggestion.

(s)

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(f) You are to plan an experimentto further investigatethe student'ssuggestion. Your plan should include: o o e

A descriptionofthe experimentto be performed. A sketchofthe graph to be plotted to test the results. An indication ofhow kcould be determinedfrom the graph.

(s) (Total 24 marks) TOTAL FOR PAPER: 48 MARKS END

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QB

List of data, formulae and relationships Data c = 3.00 x lOEm s I ' I = 9.81m s g = 9.81N kg-t

Speedof light in vacuum Acceleration of free fall Gravitational field strength

(close to the Earth) (close to the Earth)

e = 1.60x 10-reC m " - Q . l1 , .l 0 l r k g

Elementary(proton) charge E l e c t r o n im c ass

IeV=1.60x10reJ

Electronvolt M o l a rg a sc o n s t a n t

R=8.3lJKrmolr

Rectilinear molion For uniformly acceleratedmotion: u=u+al x=ul+\at2 r.tz=uz +2ax Fotces and momen$ Moment of F about O:.F x (Perpendiculardistancefrom F to O) Sum of anticlockwisemoments aboutthat point

Sum of clockwisemoments aboutany point in a plane

Dynamics -

Force

Atr

Lp

a/

Lt

FLt-Lp

Impulse Mechanical energt

p = Fu

power Radioaclive decay and the nuclear atom Activity

A= )"N

Half-life

7t, =0.69

(Decay constant7,)

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Electrical cunent and potentfurldffircnce I = nAQrt Electriccurrent Electricpower

P=IZR

Electrical circuits Terminalpotentialdifference

V = E - Ir Zt =ZIR

Circuit e.m.f.

(E.m.f.6; Intemalresistance r)

Resistorsin series

-R= Rr+ Rz+ R:

Resistors inparallel

:=+-+-+ R R I R '

R :

Heating mafrer Changeof state:

energy transfer = /Ar,

(Specific latent heat or specific enthalpy change/)

Heating and cooling:

en€rgy hansfer = mc^f

(Specific heat capacity c; TemperaturechangeAI)

el"C =TlK-273

Celsiustemperature Kinetic lheory of matter

I ccAveragekinetic energyof molecules

p =\ ok'?l

Kinetic theory Consemationof energt

LU - LQ+ LIy

Changeof intemalenergy

(EnergytansfenedthermallyAQ; Work doneon bodyAI4J

- Usefuloutput Input

Elliciencyof energytranst-er

T,_T^ Fora heatengine.maximumefiiciency=:f I1

Experimental physics Percentageuncertainty =

x 100% Estimated uncertainty Average value

Mathematics sin(90'-0) = cos0 y=mx+c

Equation ofa straightline

cylinder=2nrh+2nrz

Surface area

sphere= 4nr2 cylinder = nrzh sphere= {nr3 sin9 x tanOx0

Volume

For small angles:

(in radians)

cosd . 1

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