0625_s18_qp_41.pdf

# 0625_s18_qp_41.pdf - Cambridge International Examinations...

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* 5 4 9 8 1 5 2 3 9 1 * This document consists of 14 printed pages and 2 blank pages. DC (CE/SW) 150767/5 © UCLES 2018 [Turn over Cambridge International Examinations Cambridge International General Certificate of Secondary Education PHYSICS 0625/41 Paper 4 Theory (Extended) May/June 2018 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 an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. Take the weight of 1.0 kg to be 10 N (acceleration of free fall = 10 m / s 2 ). 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. This syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.

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2 0625/41/M/J/18 © UCLES 2018 1 Fig. 1.1 shows the speed-time graph for a vehicle accelerating from rest. 0 0 5 10 15 20 25 30 20 40 60 80 time / s speed m / s 100 120 140 160 Fig. 1.1 (a) Calculate the acceleration of the vehicle at time = 30 s. acceleration = ........................................................... [2] (b) Without further calculation, state how the acceleration at time = 100 s compares to the acceleration at time = 10 s. Suggest, in terms of force, a reason why any change has taken place. ................................................................................................................................................... ................................................................................................................................................... ............................................................................................................................................... [3] (c) Determine the distance travelled by the vehicle between time = 120 s and time = 160 s. distance = ........................................................... [3] [Total: 8]
3 0625/41/M/J/18 © UCLES 2018 [Turn over 2 Fig. 2.1 shows a fork-lift truck lifting a box. box Fig. 2.1 The electric motor that drives the lifting mechanism is powered by batteries. (a) State the form of the energy stored in the batteries. ............................................................................................................................................... [1] (b) The lifting mechanism raises a box of mass 32 kg through a vertical distance of 2.5 m in 5.4 s. (i) Calculate the gravitational potential energy gained by the box. gravitational potential energy = ........................................................... [2] (ii) The efficiency of the lifting mechanism is 0.65 (65%). Calculate the input power to the lifting mechanism. input power = ........................................................... [3] (c) The batteries are recharged from a mains voltage supply that is generated in an oil-fired power station.

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