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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level * 5 5 4 1 7 2 3 9 7 7 * PHYSICS…

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level * 5 5 4 1 7 2 3 9 7 7 * PHYSICS 9702/35 Advanced Practical Skills 1 May/June 2011 2 hours Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions. 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 soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer both questions. You will be allowed to work with the apparatus for a maximum of one hour for each question. You are expected to record all your observations as soon as these observations are made, and to plan the presentation of the records so that it is not necessary to make a fair copy of them. You may lose marks if you do not show your working or if you do not use appropriate units. Additional answer paper and graph paper should be used 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. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 2 Total This document consists of 11 printed pages and 1 blank page. DC (SM/CGW) 34240/3 © UCLES 2011 [Turn over 2 You may not need to use all of the materials provided. For Examiner’s Use 1 In this experiment you will investigate how the motion of two pendulums depends on the tension in a spring connecting them. (a) Measure and record the unstretched length l 0 of the coiled part of the spring as shown in Fig. 1.1. l0 Fig. 1.1 l 0 = .................................................. [1] (b) (i) Set up the apparatus as shown in Fig. 1.2. loop of string over rod of clamp spring 50 cm bob A bob B at least 5 cm bench Fig. 1.2 (ii) Position the stands so that the coiled part of the spring has approximate length l 0 + 2 cm (so that the spring is extended by approximately 2 cm). © UCLES 2011 9702/35/M/J/11 3 (iii) Measure and record the length l of the coiled part of the spring. For Calculate the extension x of the spring, where x = l – l 0. Examiner’s Use l = ...................................................... x = ...................................................... (iv) Gently pull bob A towards you. Release the bob and watch the movement of the two bobs. Bob A will eventually stop and start moving again. It will then stop for a second time. Determine and record the time T between these two stops. T = .................................................. [2] © UCLES 2011 9702/35/M/J/11 [Turn over 4 (c) By moving the stands further apart, repeat (b)(iii) and (b)(iv) until you have six sets of For readings of l, x and T, with x in the range 2 cm 艋 x 艋 10 cm. Examiner’s Use [9] (d) (i) Plot a graph of T on the y-axis against x on the x-axis. [3] (ii) Draw the straight line of best fit. [1] (iii) Determine the gradient and y -intercept of this line. gradient = ...................................................... y-intercept = ...................................................... [2] © UCLES 2011 9702/35/M/J/11 5 For Examiner’s Use © UCLES 2011 9702/35/M/J/11 [Turn over 6 (e) It is suggested that the quantities T and x are related by the equation For Examiner’s T = px + q Use where p and q are constants. Use your answers in (d)(iii) to determine the values of p and q. Give appropriate units. p = ...................................................... q = ...................................................... [1] (f) Use your values in (e) to determine the extension x that would be expected to give a value of T = 75 s. x = .................................................. [1] © UCLES 2011 9702/35/M/J/11 7 BLANK PAGE Please turn over for Question 2. © UCLES 2011 9702/35/M/J/11 [Turn over 8 You may not need to use all of the materials provided. For Examiner’s Use 2 In this experiment you will drop a mass onto a rod standing in sand and investigate the distance that the rod moves into the sand. (a) You have been provided with two wooden rods of different diameters. Measure and record the diameter d of the thicker rod. d = .................................................. [2] (b) Flatten the surface of the sand. Stand the rod vertically in the sand up to the mark drawn on the rod, as shown in Fig. 2.1. wooden rod sand mark on rod container Fig. 2.1 © UCLES 2011 9702/35/M/J/11 9 (c) (i) Hold the mass hanger so that the distance h between its bottom and the top of the For rod is approximately 10 cm. Examiner’s The centre of the bottom of the mass hanger should be vertically above the wooden Use rod, as shown in Fig. 2.2. mass hanger h wooden rod sand Fig. 2.2 (ii) Measure and record the height h. h = .................................................. [1] (d) (i) Drop the mass hanger from this height h above the rod. (ii) Without making a further mark on the rod, determine the new length x of the rod below the surface of the sand, as shown in Fig. 2.3. x Fig. 2.3 x = .................................................. [1] © UCLES 2011 9702/35/M/J/11 [Turn over 10 (iii) Calculate and record the change in depth y of the rod in the sand as a result of the For impact of the mass hanger. Examiner’s Use y = .................................................. [1] (e) Estimate the percentage uncertainty in your value of y. percentage uncertainty = .................................................. [1] (f) Using the thinner rod repeat (a), (b), (c)(i), and (d). Use the same value of h as in (c)(ii). d = ....................................................... x = ...................................................... y = ...................................................... [3] © UCLES 2011 9702/35/M/J/11 11 (g) It is suggested that the quantities y and d are related by the equation For Examiner’s Use k y = d2 where k is a constant. (i) Using your data, calculate two values of k. first value of k = ...................................................... second value of k = ...................................................... [1] (ii) Explain whether your results support the suggested relationship. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. .............................................................................................................................. [1] (iii) Justify the number of significant figures that you have given for your values of k. .................................................................................................................................. .................................................................................................................................. .............................................................................................................................. [1] © UCLES 2011 9702/35/M/J/11 [Turn over 12 (h) (i) Describe four sources of uncertainty or limitations of the procedure for this For experiment. Examiner’s Use 1. ............................................................................................................................... .................................................................................................................................. 2. ............................................................................................................................... .................................................................................................................................. 3. ............................................................................................................................... .................................................................................................................................. 4. ............................................................................................................................... .................................................................................................................................. [4] (ii) Describe four improvements that could be made to this experiment. You may suggest the use of other apparatus or different procedures. 1. ............................................................................................................................... .................................................................................................................................. 2. ............................................................................................................................... .................................................................................................................................. 3. ............................................................................................................................... .................................................................................................................................. 4. ............................................................................................................................... .................................................................................................................................. [4] Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher 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 of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. © UCLES 2011 9702/35/M/J/11

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