A-level PHYSICS A PHYA4/1. Unit 4 Fields and Further Mechanics. Section A. Monday 20 June 2016 Morning

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1 Please write clearly in block capitals. entre number aniate number Surname Forename(s) aniate signature -level PHYSIS Unit 4 Fiels an Further Mechanics Section Monay 20 June 2016 Morning Materials In aition to this paper you will require: an objective test answer sheet a black ball-point pen a calculator a question paper/answer book for Section (enclose) a ata an Formulae booklet. Time allowe: The total time for both sections of this paper is 1 hour 45 minutes. You are avise to spen approximately 45 minutes on this section. Instructions Use a black ball-point pen. nswer all questions in this section. For each question there are four responses. When you have selecte the response which you think is the most appropriate answer to a question, mark this response on your answer sheet. Mark all responses as instructe on your answer sheet. If you wish to change your answer to a question, follow the instructions on your answer sheet. o all rough work in this book not on the answer sheet. Information The maximum mark for this section is 25. ll questions in Section carry equal marks. No euctions will be mae for incorrect answers. ata an Formulae ooklet is provie as a loose insert. The question paper/answer book for Section is enclose within this question paper. WMP/Jun16/E3 PHY4/1

2 2 o not write Multiple choice questions Each of Questions 1 to 25 is followe by four responses,,,, an. For each question select the best response an mark its letter on the answer sheet. You are avise to spen about 45 minutes on this section. 1 Which line, to, in the table correctly shows what is conserve in an elastic collision? Mass Momentum Kinetic energy Total energy conserve not conserve conserve conserve not conserve conserve conserve not conserve conserve conserve not conserve conserve conserve conserve conserve conserve 2 The graph shows how the resultant force applie to an object of mass 2.0 kg, initially at rest, varies with time. resultant force / N time / s What is the spee of the object after 1.0 s? 2.5 m s m s m s 1 10 m s 1 3 What is the angular spee of a car wheel of iameter m when the spee of the car is 108 km h 1? 75 ra s ra s ra s ra s 1 (02) WMP/Jun16/PHY4/1

3 3 o not write 4 ball of mass 0.30 kg is attache to a string an moves in a vertical circle of raius 0.60 m at a constant spee of 5.0 m s 1. Which line, to, in the table gives the correct values of the minimum an maximum tension in the string? Minimum tension / N Maximum tension / N Which one of the following statements is true when an object performs simple harmonic motion about a central point? The acceleration is always irecte away from the central point. The acceleration an velocity are always 180º out of phase. The velocity an isplacement are always in the same irection. cceleration an isplacement are always 180º out of phase. 6 The graph shows how velocity changes with time for a simple penulum moving with simple harmonic motion. velocity 0 T 4 T 2 3T 4 T time Which one of the following statements relate to the motion of the penulum is incorrect? The acceleration is a minimum at T. 4 The acceleration is a maximum at T. 2 The kinetic energy is a maximum at T. 2 The restoring force is a minimum at 3T. 4 7 mass hanging on the en of a spring unergoes vertical simple harmonic motion. t which point(s) is the magnitue of the resultant force on the mass a minimum? at both the top an bottom of the oscillation only at the top of the oscillation only at the bottom of the oscillation at the centre of the oscillation Turn over (03) WMP/Jun16/PHY4/1

4 4 o not write 8 The iagram shows a string XY supporting a heavy penulum P an four penulums,, an of smaller mass. X Y P Penulum P is set in oscillation perpenicular to the plane of the iagram. Which one of the penulums, to, then oscillates with the largest amplitue? 9 Two planets X an Y are in concentric circular orbits about a star S. The raius of the orbit of X is R an the raius of orbit of Y is 2R. R X S 2R Y The gravitational force between X an Y is F when angle SXY is 90º, as shown in the iagram. What is the gravitational force between X an Y when they are nearest to each other? 2F 3F 4F 5F (04) WMP/Jun16/PHY4/1

5 5 o not write 10 X an Y are two stars of equal mass M. The istance between their centres is. star X P star Y What is the gravitational potential at the mi-point P between them? GM 2 GM 4GM 8GM 11 geosynchronous satellite is in a constant raius orbit aroun the Earth. The Earth has a mass of kg an a raius of m. What is the height of the satellite above the Earth s surface? m m m m n point charge X is at a fixe istance from a 1.0 n point charge Y. The force between the two charges is F. X Y +2.0 n 1.0 n If an aitional charge of +2.0 n is supplie to both X an Y, which line, to, in the table gives the magnitue an irection of the force on X? Magnitue irection 2 F from X to Y 4 F from X to Y 2 F from Y to X 4 F from Y to X Turn over (05) WMP/Jun16/PHY4/1

6 6 o not write 13 The iagram shows a charge Q being move from point X to point Y between two charge parallel plates separate by a istance. + X Q Y Which one of the following graphs best illustrates how the magnitue of force F on the charge varies with istance as it moves towars Y? F F 0 0 istance 0 0 istance F F 0 0 istance 0 0 istance (06) WMP/Jun16/PHY4/1

7 7 o not write 14 The iagram shows four point charges, each +Q, at the corners of a square of sie 2a. +Q +Q 2a P What is the electric fiel strength at P, the centre of the square? zero Q 4ε 0 a 2 Q 2ε 0 a 2 Q ε 0 a 2 +Q +Q 2a 15 The iagram shows the fiel lines in a region of an electric fiel create by a positive charge. X Y Which one of the following statements is correct? When moving from X to Y the electric potential is constant. the electric potential increases. the electric potential ecreases. the electric potential changes from positive to negative. Turn over (07) WMP/Jun16/PHY4/1

8 8 o not write 16 The iagram shows two point charges of magnitue +Q an 2Q place a istance r apart. +Q 2Q P r r What is the electric potential at point P, a istance r to the right of the 2Q charge? 3Q 8ε 0 r Q 2ε 0 r Q + 8ε 0 r 17 5Q + 8ε 0 r +5.0 n S R 100 mm 120 mm The potentials at points R an S ue to the +5.0 n charge are 375 V an 450 V respectively. How much work is one when a +2.0 n charge is move from R to S? 0.12 μj 0.15 μj 0.19 μj 0.38 μj 18 The gravitational constant, G, is a constant of proportionality in Newton s law of gravitation. The permittivity of free space, ε 0, is a constant of proportionality in oulomb s law. When comparing the electrostatic force acting on a pair of charge particles to the gravitational force between them, the prouct ε 0 G can appear in the calculation. Which is a unit for ε 0 G? 2 kg 2 2 m 2 F kg 2 N 1 m 2 it has no unit (08) WMP/Jun16/PHY4/1

9 9 o not write 19 variable capacitor has a capacitance which can be varie from F to F. The capacitor is set to its maximum capacitance an fully charge using a 48 V supply. The capacitor is then isconnecte from the supply an isolate. Finally the capacitance is reuce to its minimum value without any charge being lost by the capacitor. Which line, to, in the table correctly shows the potential ifference (p) across the capacitor an the charge it stores after the capacitance has been reuce? p / V harge / The capacitor in the circuit is initially uncharge. The switch S is close at time t = 0. Which pair of graphs, to, correctly shows how the p across the capacitor an the current in the circuit change with time? S p current 0 0 time t 0 0 time t p current time t 0 time t p current time t 0 time t p current 0 0 time t 0 0 time t Turn over (09) WMP/Jun16/PHY4/1

10 10 o not write 21 The iagram shows a horizontal conuctor of length 50 mm carrying a current of 3.0 at right angles to a uniform horizontal magnetic fiel of flux ensity 0.50 T. 3.0 magnetic fiel 50 mm conuctor What is the magnitue an irection of the magnetic force on the conuctor? N vertically upwars N vertically ownwars 75 N vertically upwars 75 N vertically ownwars 22 The iagram shows a coil place in a uniform magnetic fiel. In the position shown, the angle between the normal to the plane of the coil an the magnetic fiel is ra. 3 clockwise anticlockwise coil 3 uniform magnetic fiel axle Which line, to, in the table shows the angles through which the coil shoul be rotate, an the irection of rotation, so that the flux linkage becomes (i) a maximum, an (ii) a minimum? ngle of rotation / ra (i) for maximum flux linkage (ii) for minimum flux linkage clockwise anticlockwise 6 3 anticlockwise clockwise 6 3 clockwise anticlockwise 3 6 anticlockwise clockwise 3 6 (10) WMP/Jun16/PHY4/1

11 11 o not write 23 train is travelling at 20 m s 1 along a horizontal track through a uniform magnetic fiel of flux ensity T acting vertically ownwars. What is the emf inuce between the ens of an axle 1.5 m long? V V V V 24 The primary coil of a step-up transformer is connecte to a source of alternating p. The seconary coil is connecte to a lamp. Which line, to, in the table correctly escribes the ratios of flux linkages an currents through the seconary coil in relation to the primary coil? Seconary magnetic flux linkage Primary magnetic flux linkage Seconary current Primary current < 1 < 1 > 1 < 1 > 1 > 1 < 1 > 1 25 Which one of the following statements is the main reason for operating power lines at high voltage? Transformers are never perfectly efficient. High voltages are require by many inustrial users of electricity. Electrical generators prouce alternating current. For a given amount of transmitte power, increasing the voltage ecreases the current. EN OF QUESTIONS (11) WMP/Jun16/PHY4/1

12 12 There are no questions printe on this page O NOT WRITE ON THIS PGE NSWER IN THE SPES PROVIE opyright Information For confientiality purposes, from the November 2015 examination series, acknowlegements of thir party copyright material will be publishe in a separate booklet rather than incluing them on the examination paper or support materials. This booklet is publishe after each examination series an is available for free ownloa from after the live examination series. Permission to reprouce all copyright material has been applie for. In some cases, efforts to contact copyright-holers may have been unsuccessful an Q will be happy to rectify any omissions of acknowlegements. If you have any queries please contact the opyright Team, Q, Stag Hill House, Guilfor, GU2 7XJ. opyright 2016 Q an its licensors. ll rights reserve. (12) WMP/Jun16/PHY4/1