CAIE Physics (9702)

In this experiment, you will determine the resistivity of a metal. wire tape tape 1.5 V metre rule Fig. 1.1 (not to scale) Adjust the position of crocodile clip F so that L is approximately 45 cm. L = cm V = V [1] * 0000800000003 *

Vary L in the range 15.0 cm G L G 95.0 cm by adjusting the position of F . For each position of F, measure L and V. Repeat until you have six sets of values of L and V. Record your results in a table. Include values ofand in your table.

(i) Plot a graph of on the y-axis against on the x-axis.

Draw the straight line of best fit.

Determine the gradient and y-intercept of this line. gradient = y-intercept = [2] * 0000800000004 *

It is suggested that the quantities V and L are related by the equation + W where J and W are constants. Using your answers in (c)(iii), determine the values of J and W. Give appropriate units. J = W =

(i) Use a micrometer to measure the diameter d of the wire. d =

Theory suggests thatJ = where R is 33 Ω and ρ is the resistivity of the metal of the wire. Using your answers in (d) and (e)(i), determine a value for ρ . ρ = Ω m [1] [Total: 20] * 0000800000006 * You may not need to use all of the materials provided.

In this experiment, you will investigate the movement of a ball.

You are provided with two table tennis balls A and B, each attached to a string. The mass of A and its string is m. Use the balance to measure m. m = g [1] the clamp, as shown in Fig. 2.1. blockball string stand wooden stripsclamp ball bench Fig. 2.1 (not to scale) 50 cm above the bench and the bottoms of the two balls are approximately 1.5 cm above the bench. * 0000800000007 * centre of A is level with the top of the block, as shown in Fig 2.2. block Fig. 2.2 (not to scale) The distance between the top of the block and the bench is d. Measure and record b and d. b = cm d = cm Give an appropriate unit. db- =

Justify the number of significant figures that you have given for your value of db-. At the maximum height of ball B, the vertical distance between the centre of B and the bench is H, as shown in Fig. 2.3. Fig. 2.3 (not to scale) Determine H. H = cm

Estimate the percentage uncertainty in your value of H. Show your working. percentage uncertainty = %

With this arrangem ent of the apparatus, the total mass of A is equal to m measured in

. M = g Hb- = [1] * 0000800000009 * The total mass M of A is now equal to the sum of m and the mass of the slotted mass. centre of A is level with the top of the block, as shown in Fig. 2.2. H = cm M = g Hb- =

It is suggested that the relationship between H, b, m, M and d is Md b where k is a constant. Using your data, calculate two values of k. first value of k = second value of k = [1] * 0000800000010 * [ b

It is suggested that the percentage uncertainty in the values of k is 15%. Using this uncertainty, explain whether your results support the relationship in

. [[b Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable ef fort 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. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cambridgeinternational.org after the live examination series. Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge.

(i) Describe four sources of uncertainty or limitations of the procedure for this experiment. For any uncertainties in measurement that you describe, you should state the quantity being measured and a reason for the uncertainty. 1 2 3 4

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] [Total: 20] * 0000800000012 * [Tb