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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level * 8 2 5 6 4 9 4 0 3 7 * PHYSICS 9702/52 Paper 5 Planning,…
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Level * 8 2 5 6 4 9 4 0 3 7 * PHYSICS 9702/52 Paper 5 Planning, Analysis and Evaluation May/June 2012 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 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 all questions. You may lose marks if you do not show your working or if you do not use appropriate units. 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 8 printed pages. DC (KN/SW) 42263/3 © UCLES 2012 [Turn over 2 1 A hot air balloon is tied to the ground using a rope. As the wind blows with speed v, the rope For makes an angle θ to the horizontal, as shown in Fig 1.1. Examiner’s Use wind with speed v rope θ ground Fig 1.1 It is suggested that tan θ is inversely proportional to v 2. To model the hot air balloon in the laboratory, a balloon filled with helium is used. Design a laboratory experiment using a small helium-filled balloon to test the relationship between θ and v. You should draw a diagram, on page 3, showing the arrangement of your equipment. In your account you should pay particular attention to (a) the procedure to be followed, (b) the measurements to be taken, (c) the control of variables, (d) the analysis of the data, (e) the safety precautions to be taken. [15] © UCLES 2012 9702/52/M/J/12 3 Diagram For Examiner’s Use ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ © UCLES 2012 9702/52/M/J/12 [Turn over 4 For ......................................................................................................................................................... Examiner’s Use ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... Defining the Methods of Method of Safety Additional For problem data collection analysis considerations detail Examiner’s Use © UCLES 2012 9702/52/M/J/12 5 2 A student investigates how the resonant length L of a loaded wire varies with frequency f. For Examiner’s Use wire L signal generator 30 N Fig. 2.1 For six different frequencies, the student records the length L. Question 2 continues on the next page. © UCLES 2012 9702/52/M/J/12 [Turn over 6 It is suggested that f and L are related by the equation For Examiner’s f= 1 T Use 2L μ where T is the tension in the wire and μ is a constant. (a) A graph is plotted of f on the y-axis against 1 / L on the x-axis. Determine an expression for the gradient in terms of T and μ. gradient = .................................................. [1] (b) Values of f and L are given in Fig. 2.2. f / Hz L / 10–2 m 256 54.5 ± 0.5 294 48.0 ± 0.5 330 42.5 ± 0.5 350 40.0 ± 0.5 396 35.5 ± 0.5 440 32.0 ± 0.5 Fig. 2.2 Calculate and record values of (1 / L) / m–1 in Fig. 2.2. Include the absolute uncertainties in 1 / L. [3] (c) (i) Plot a graph of f / Hz against (1 / L) / m–1. Include error bars for 1 / L. [2] (ii) Draw the straight line of best fit and a worst acceptable straight line on your graph. Both lines should be clearly labelled. [2] (iii) Determine the gradient of the line of best fit. Include the uncertainty in your answer. gradient = .................................................. [2] © UCLES 2012 9702/52/M/J/12 7 450 For Examiner’s Use 430 f / Hz 410 390 370 350 330 310 290 270 250 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 (1 / L) / m–1 © UCLES 2012 9702/52/M/J/12 [Turn over 8 (d) (i) The tension T in the wire is 30 ± 3 N. Using your answer to (c)(iii), determine the For value of μ. Include an appropriate unit in your answer. Examiner’s Use μ = .................................................. [2] (ii) Determine the percentage uncertainty in μ. percentage uncertainty = ..................................................% [1] (e) An expression for μ is μ = ρ πr 2 where the density ρ of the wire is 8800 kg m–3 and r is the radius of the wire. (i) Using your answer to (d)(i), determine a value for r. r = ..................................................m [1] (ii) Determine the percentage uncertainty in your value of r. percentage uncertainty = ..................................................% [1] 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 2012 9702/52/M/J/12
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