PHYA2. General Certificate of Education Advanced Subsidiary Examination June Mechanics, Materials and Waves (JUN11PHYA201) TOTAL
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1 Centre Number Surname Candidate Number For Examiner s Use Other Names Candidate Signature Examiner s Initials Physics A Unit 2 For this paper you must have: l a pencil and a ruler l a calculator l a Data and Formulae Booklet. General Certificate of Education Advanced Subsidiary Examination June 2011 Mechanics, Materials and Waves Monday 6 June pm to 2.45 pm PHYA2 Question TOTAL Mark Time allowed l 1 hour 15 minutes Instructions l Use black ink or black ball-point pen. l Fill in the es at the top of this page. l Answer all questions. l You must answer the questions in the spaces provided. around each page or on blank pages. l Do all rough work in this book. Cross through any work you do not want to be marked. Information l The marks for questions are shown in brackets. l The maximum mark for this paper is 70. l You are expected to use a calculator where appropriate. l A Data and Formulae Booklet is provided as a loose insert. l You will be marked on your ability to: use good English organise information clearly use specialist vocabulary where appropriate. (JUN11PHYA201) PHYA2
2 2 Answer all questions in the spaces provided. 1 A boy throws a ball vertically upwards and lets it fall to the ground. Figure 1 shows how displacement relative to the ground varies with time for the ball. displacement Figure 1 ground level t 0 t 1 t 2 time 1 (a) (i) State which feature of a displacement-time graph represents the velocity. (1 mark) 1 (a) (ii) On the axes below, draw the shape of the velocity-time graph for the ball between t 0 and t 2. The starting point is labelled X. velocity X 0 t 0 t 1 t 2 time (02)
3 3 1 (b) Figure 2 shows the ball deforming as it contacts the ground, just at the point where it is stationary for an instant and has reached maximum deformation. centre of mass Figure 2 1 (b) (i) Explain how Newton s third law of motion applies to Figure 2. 1 (b) (ii) Explain why there is a resultant upward force on the ball in Figure 2. 8 Turn over for the next question Turn over (03)
4 4 2 A student measures the acceleration due to gravity, g, using the apparatus shown in Figure 3. A plastic card of known length is released from rest at a height of 0.50 m above a light gate. A computer calculates the velocity of the card at this point, using the time for the card to pass through the light gate. Figure 3 plastic card light gate computer interface 2 (a) The computer calculated a value of 3.10 ms 1 for the velocity of the card as it travelled through the light gate. Calculate a value for the acceleration due to gravity, g, from these data. answer =... ms 2 2 (b) The student doubles the mass of the card and finds a value for g that is similar to the original value. Use the relationship between weight, mass and g to explain this result. (1 mark) (04)
5 5 2 (c) State and explain one reason why the card would give more reliable results than a table tennis ball for this experiment. 5 Turn over for the next question Turn over (05)
6 6 3 Figure 4 shows a rollercoaster train that is being accelerated when it is pulled horizontally by a cable. Figure 4 pulling force cable rollercoaster train 3 (a) The train accelerates from rest to a speed of 58 ms 1 in 3.5 s. The mass of the fully loaded train is 5800 kg. 3 (a) (i) Calculate the average acceleration of the train. answer =... ms 2 3 (a) (ii) Calculate the average tension in the cable as the train is accelerated, stating an appropriate unit. answer =... (06)
7 7 3 (a) (iii) Calculate the distance the train moves while accelerating from rest to 58 ms 1. answer =... m 3 (a) (iv) The efficiency of the rollercoaster acceleration system is 20%. Calculate the average power input to this system during the acceleration. answer =... W 3 (b) After reaching its top speed the driving force is removed and the rollercoaster train begins to ascend a steep track. By considering energy transfers, calculate the height that the train would reach if there were no energy losses due to friction. answer =... m 13 Turn over (07)
8 8 4 Horses were once used to power machinery in factories, mines and mills. Figure 5 shows two horses attached to a beam which turns a wheel. This wheel drives machinery. Figure 5 horse pivot horse 810 N 810 N beam wheel 7.3 m 4 (a) Each horse exerts a force of 810 N and the length of the beam is 7.3 m. 4 (a) (i) Define the moment of a couple. 4 (a) (ii) Calculate the moment of the couple exerted by the horses, stating an appropriate unit. answer =... (08)
9 9 4 (b) The horses move at a constant speed of 0.91 ms 1. Calculate the combined power output of the two horses. Give your answer to an appropriate number of significant figures. answer =... W 4 (c) During the Industrial Revolution in the 19 th Century, James Watt became well known for developing and improving steam engines to replace horses. He defined the unit of power called horsepower by studying a system similar to the one shown in Figure 5. Suggest why Watt decided to use horsepower as a unit of power. (1 mark) 8 Turn over for the next question Turn over (09)
10 10 5 (a) The speed of light is given by c = f λ State how each of these quantities will change, if at all, when light travels from air to glass. c... f... λ... Figure 6 shows a side view of a step index optical fibre. light rays in air B cladding Figure 6 not drawn to scale A θ core cladding 5 (b) Ray A enters the end of the fibre and then undergoes total internal reflection. On Figure 6 complete the path of this ray along the fibre. 5 (c) (i) The speed of light in the core is ms 1. Show that the refractive index of the core is (c) (ii) Show that the critical angle at the boundary between the core and the cladding is about 80. refractive index of the cladding = 1.45 (10)
11 11 5 (d) Ray B enters the end of the fibre and refracts along the core-cladding boundary. Calculate the angle of incidence, θ, of this ray at the point of entry to the fibre. answer =... degrees 5 (e) Figure 7 shows a pulse of monochromatic light (labelled X) that is transmitted a significant distance along the fibre. The shape of the pulse after travelling along the fibre is labelled Y. Explain why the pulse at Y has a lower amplitude and is longer than it is at X. Figure 7 X optical fibre Y 14 Turn over (11)
12 12 6 The table below shows the results of an experiment where a force was applied to a sample of metal. 6 (a) On the axes below, plot a graph of stress against strain using the data in the table. strain /10 3 stress /10 8 Pa stress / 10 8 Pa strain / (b) Use your graph to find the Young modulus of the metal. answer =... Pa (12)
13 13 6 (c) A 3.0 m length of steel rod is going to be used in the construction of a bridge. The tension in the rod will be 10 kn and the rod must extend by no more than 1.0 mm. Calculate the minimum cross-sectional area required for the rod. Young modulus of steel = Pa answer =... m 2 8 Turn over for the next question Turn over (13)
14 14 7 A scientist is going to use a double-slit arrangement to carry out measurements in order to determine the wavelength of light from a laser. Figure 8 screen laser double slit 7 (a) The scientist has a double slit of known separation. Describe the measurements that need to be taken and explain how they are used to find the wavelength of the light. Discuss any necessary safety precautions and how you would arrange the apparatus to improve accuracy. The quality of your written communication will be assessed in this question. (6 marks) (14)
15 15 7 (b) In 1802 Thomas Young used candle light to observe the interference pattern from two narrow slits acting as coherent light sources. Explain what is meant by coherent light sources. 7 (c) Sketch and label on the diagram below the arrangement that Young would have used to obtain his interference pattern. candle screen 7 (d) State two differences in the appearance of the pattern obtained with a laser and that produced by a white light source such as a candle. Difference 1... Difference (e) Explain how the wave theory of light accounts for the areas on the screen where the intensity is a minimum. END OF QUESTIONS 14 (15)
16 16 There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED Copyright 2011 AQA and its licensors. All rights reserved. (16)
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