PHYSICS 0625/42 - Physics & Maths Tutor

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Cambridge International Examinations Cambridge International General Certificate of Secondary Education

PMT

PHYSICS Paper 4 Theory (Extended)

Candidates answer on the Question Paper. No Additional Materials are required.

0625/42 May/June 2016 1 hour 15 minutes

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 / s2).

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.

The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate.

This document consists of 22 printed pages and 2 blank pages.

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PMT 2 1 (a) An object is moving in a straight line at constant speed. A force is applied to the object. State the possible changes in the motion of the object. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... [2] (b) Fig. 1.1 shows a skier taking part in a speed competition. The winner of the competition has the highest average speed over the 100 m section shown in Fig. 1.1. start skier

100 m

Fig. 1.1 (i) The skier starts from rest and has a constant acceleration. He reaches a speed of

60 m / s in 16 s. Calculate the skier's acceleration.

acceleration = ................................................................. [2]

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3 (ii) Over the length of the 100 m section, the time recorded is 1.85 s.

Calculate the skier's average speed over the section.

PMT

average speed = ................................................................. [2] (iii) Suggest why the skier bends his body, as shown in Fig. 1.1.

Explain your answer. ................................................................................................................................ ................................................................................................................................ ................................................................................................................................ [2]

[Total: 8]

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4 2 Fig. 2.1 shows two railway trucks on a track.

buffer

truck B 5000 kg

5.0 m / s truck A 6000 kg

track

PMT

Fig. 2.1

Truck A of mass 6000 kg is moving at 5.0 m / s. It is approaching truck B of mass 5000 kg, which is stationary. (a) Calculate the momentum of truck A.

momentum = ................................................................. [2]

(b) The trucks collide, their buffers compress and then they bounce off each other, remaining undamaged. After the collision, truck B has a momentum of 27 000 kg m / s. (i) Determine the impulse applied to truck B.

impulse = ................................................................. [2]

(ii) The trucks are in contact for 0.60 s. Calculate the average force on truck B.

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force = ................................................................. [2]

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5 (iii) Calculate the final speed of truck A.

PMT

speed = ................................................................. [3] [Total: 9]

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