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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONSGeneral Certificate of EducationAdvanced Subsidiary Level and Advanced LevelPHYSICSPaper 3 Practical TestMay/June 2004Candidates answer on the Question Paper.Additional Materials:As specified in the Confidential Instructions.9702/031 hour 15 minutesREAD THESE INSTRUCTIONS FIRSTWrite your Centre number, candidate number and name on all the work you hand in.Write in dark blue or black pen in the spaces provided on the Question Paper.You may use a soft pencil for any diagrams, graphs or rough working.Do not use staples, paper clips, highlighters, glue or correction fluid.Answer the onequestion.You are expected to record all your observations as soon as these observations are made, and to plan thepresentation of the records so that it is not necessary to make a fair copy of them. The working of theanswers is to be handed in.Marks are mainly given for a clear record of the observations actually made, for their suitability andaccuracy, and for the use made of them.Additional answer paper and graph paper should be submitted only if it becomes necessary to do so.You are reminded of the need for good English and clear presentation in your answers.At the end of the examination, fasten all your work securely together.For Examiner’s UseIf you have been given a label, look at thedetails. If any details are incorrect ormissing, please fill in your correct detailsin the space given at the top of this page.Stick your personal label here, ifprovided.This document consists of 8printed pages.SPA (KN) S60436/2©UCLES 2004[Turn overhttp://www.xtremepapers.net21In this question you will determine the density of water by immersing a mass suspended by aspring into a beaker of water.(a)(i)Set up the apparatus as shown in Fig.1.1. The pointers A and B should be attachedto each end of the spring. The pointer A should also be attached to the paper clip.The pointer B should be attached to the mass holder. The total mass of the holderand the masses should be 200g.50 cm rulepaper clipAB200 g massFig. 1.1©UCLES 20049702/03/M/J/04

ForExaminer’sUse3(ii)Record the reading from pointer B.reading from pointer B = ................................................. m(iii)Add a further mass of 100g (0.98N weight) to the mass holder and record the newreading from pointer B.new reading from pointer B = ................................................. m(iv)Hence determine the extension of the spring when an additional force of 0.98N isapplied to the spring.extension = ................................................. m(b)Hooke’s law can be expressed in the form F= kx,where Fis the force required to produce an extension x, andkis the spring constant.Use your answers from (a)to determine a value for k. You may assume that the springobeys Hooke’s law.ForExaminer’sUsek= ........................................... Nm–1©UCLES 20049702/03/M/J/04

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(c)(i)(ii)(iii)©UCLES 20044Use the vernier callipers to measure the diameter of one of the masses.diameter = ................................................. mDetermine the percentage uncertainty in the measurement of the diameter of themass.percentage uncertainty = .....................................................Calculate the cross-sectional area A, in m2, of the mass. Ignore the slot that is cutinto the mass.A= ................................................ m29702/03/M/J/04

ForExaminer’sUse(d)(i)(ii)(iii)©UCLES 20045ForExaminer’sPut all of the masses onto the mass holder so that the spring supports a total massUseof 300g. This mass should remain constant for the rest of the experiment. Recordthe readings from the pointers A and B and hence calculate a value for the length lbetween the pointers.reading from pointer A = ................................................. mreading from pointer B = ................................................. ml= ................................................. mPlace a beaker of water under the mass as shown in Fig. 1.2. Adjust the position ofthe boss so that part of the mass is immersed in the water as shown in Fig. 1.2.bossAlBdbeaker of waterFig. 1.2Make and record measurements to determine the depth dof the submerged part ofthe mass and the length lbetween the pointers.d= ................................................. ml= ................................................. m9702/03/M/J/04

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(iv)(e)(i)(ii)(iii)©UCLES 20046Adjust the position of the boss and repeat (iii)until you have six sets of readings fordand l. Record all your readings in a table in the space below.Plot a graph of l(y-axis) against d(x-axis).Draw the line of best fit.Determine the gradient of this line.gradient = .................................................9702/03/M/J/04

ForExaminer’sUse7ForExaminer’sUse©UCLES 20049702/03/M/J/04

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8(f)Theory suggests that land dare related by the equation–ρwAgdl= + –––––––ckwhere ρwis the density of water, gis the acceleration of free fall and cis a constant. Youmay assume that g= 9.8ms–2.Use your answer from(e)(iii)together with the values of A, gand kto determine a valuefor the density of water.ForExaminer’sUseρw= ................................................(g)An accurate measurement of dis not possible with the apparatus that has beensupplied. State one difficulty that you had when making this measurement, and suggestone improvement that you would make if additional materials were available.difficulty ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................improvement ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................University of Cambridge International Examinations is part of the University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department ofthe University of Cambridge.

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