# University of Cambridge and Fig.

Topics: University of Cambridge, Tour de Georgia, UCLES Pages: 9 (1669 words) Published: May 19, 2013
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

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* 9 0 9 6 7 1 7 3 6 0 *

PHYSICS Paper 6 Alternative to Practical 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, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. 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.

0625/61
May/June 2011 1 hour

For Examiner’s Use 1 2 3 4 5 Total

This document consists of 10 printed pages and 2 blank pages. DC (LEO/SW) 28913/4 © UCLES 2011

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2 1 An IGCSE student is determining the position of the centre of mass of a triangular card. The apparatus is shown in Fig. 1.1. For Examiner’s Use

pin or nail cork A

stand card

B C

plumbline

Fig. 1.1 (a) The student hangs the card on the nail through hole A. He checks that the card is able to swing freely and then hangs the plumbline from the nail so that it is close to, but not touching, the card. When the card and plumbline are still, he makes a small mark at the edge of the card where the plumbline crosses the edge. He removes the card and draws a line from the mark to hole A. He repeats the procedure using holes B and C. Fig.1.2 is a drawing of the card.

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3
For Examiner’s Use

A

C
Fig.1.2

B

On Fig.1.2, the position of each of the marks the student makes is shown with a small cross. On Fig. 1.2, draw in the lines between the positions of the holes A, B and C and the corresponding crosses on the card. [2] (b) If the experiment is completely accurate, the centre of mass of the card is at the position where the three lines meet. On Fig. 1.2, judge the best position for the centre of mass, marking it with a small cross. Draw a line from this position to the right-angled corner of the card and measure the distance a between the centre of mass and the right-angled corner of the card. a = ........................................[3] (c) In this experiment, it is important that the card is able to swing freely. For this reason, the plumbline should not touch the card but be a small distance from it. This could cause an inaccuracy in marking the card at the correct position. Describe how you would minimise this possible inaccuracy. You may draw a diagram.

.......................................................................................................................................... ......................................................................................................................................[1] [Total: 6] © UCLES 2011 0625/61/M/J/11

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4 2 The IGCSE class is investigating the rate of cooling of water. The apparatus is shown in Fig. 2.1. For Examiner’s Use

thermometer

beaker water

Fig. 2.1 (a) Record room temperature θR as shown on the thermometer in Fig. 2.2. °C

(b) The beaker contains 200 cm3 of hot water. A student takes temperature readings as the water cools, as shown in Table 2.1. Table 2.1

–10

100

110

0

10

20

Fig. 2.2

30

40

50

60

θR = ........................................[1]

70

80

90

t/
0 30 60 90 120 150 180

θ/
79 65 58 55 53 52 51

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5 (i) (ii) Complete the column headings in Table 2.1. Calculate the temperature fall T1 during the first 30 s of cooling. T1 = ............................................ (iii) Calculate the temperature fall T2 during the final 30 s of cooling. T2 = ........................................[3] (c) Plot the graph of...