2023 JPJC Prelim H2 Phy P3

2023/JPJC/Prelim/9749/03 [Turn over Data READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Section B Answer any one question only. You are advised to spend about one and half hours on Section A and half an hour on Section B. 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 document consists of 24 printed pages. For Examiner’s Use 1 / 10 2 / 8 3 / 8 4 / 9 5 / 6 6 / 11 7 / 8 8 / 20 9 / 20 Total / 80 JURONG PIONEER JUNIOR COLLEGE JC2 Preliminary Examination 2023 PHYSICS 9749/03 Higher 2 18 September 2023 Paper 3 Longer Structured Questions 2 hours Candidates answer on the Question Paper. No additional Materials are required. Name: _______________________________ Class: ______________

2 2023/JPJC/Prelim/9749/03 Data speed of light in free space, 83.00 10c = × ms–1 permeability of free space, 7 0 104 −× =π µ Hm–1 permittivity of free space, 12 0 10 85. 8 −× =ε Fm–1 ( )( ) 910 361 −×= π Fm–1 elementary charge, 1910 60. 1 −× =e C the Planck constant, 3410 63. 6 −× =h J s unified atomic mass constant, 2710 66. 1 −× =u kg rest mass of electron, 31 e 9.11 10m −= × kg rest mass of proton, 27 p 1.67 10m −= × kg molar gas constant, 31. 8=R J K–1 mol–1 the Avogadro constant, 23 A 6.02 10N = × mol–1 the Boltzmann constant, 2310 38. 1 −× =k J K–1 gravitational constant, 1110 67. 6 −× =G N m2 kg–2 acceleration of free fall, 81. 9=g m s–2

3 2023/JPJC/Prelim/9749/03 [Turn over Formulae uniformly accelerated motion 2 2 1 at uts + = asu v 22 2+ = work done on/by a gas V p W∆ = hydrostatic pressure ghp ρ= gravitational potential GM rφ =− temperature /K / C 273.15TT = +  pressure of an ideal gas 21 3 Nmpc V= mean translational kinetic energy of an ideal gas molecule 3 2E k T= displacement of particle in s.h.m. t x xωsin0= velocity of particle in s.h.m. t v vωcos0= 22 0 x x− ± =ω electric current, Anvq=I resistors in series, ...2 1+ + =R R R resistors in parallel, .../ 1 / 1 / 121 + + =R R R electric potential, r QV 04πε= alternating current/voltage, t x xωsin0= magnetic flux density due to a long straight wire 0 2B d µ π= I magnetic flux density due to a flat circular coil 0 2 NB r µ= I magnetic flux density due to a long solenoid 0Bn µ= I radioactive decay )exp(0 t x xλ− = decay constant 1 2 ln2 tλ = Answer all questions in the spaces provided

4 2023/JPJC/Prelim/9749/03 1 A golf ball is hit from point A on the ground and moves through the air to point B. The path is illustrated in Fig. 1.1. Fig. 1.1 The ground slopes downhill with a constant gradient. The ball has an initial speed of 67 m s−1 at an angle of 14° to the horizontal. The ball hits the ground at B after 4.9 s. (a) Ignoring air resistance, calculate (i) the horizontal and vertical components of the ball’s velocity at A, horizontal component at A = ………………............... m s −1 [1] vertical component at A = ………………............... m s−1 [1] (ii) the horizontal displacement from A to B, horizontal displacement = ………………............... m [1]

5 2023/JPJC/Prelim/9749/03 [Turn over (iii) the vertical displacement from A to B, vertical displacement = ………………............... m [2] (iv) the angle of the slope to the horizontal, θ . angle θ = ………………............... ° [2] (b) In a real situation, air resistance provides a force on the ball in the opposite direction to its motion. (i) On Fig. 1.1, sketch a likely path of the ball hit from A when air resistance is taken into account. [1] (ii) Give reasons for the shape you have drawn in (b)(i) for 1. the path of the ball at the start, …………………………………………………………………………………………. …………………………………………………………………………………………. ……………………………………………………………………………..……… [1] 2. the angle at which the ball hits the ground. …………………………………………………………………………………………. …………………………………………………………………………………………. ……………………………………………………………………………..……… [1]

6 2023/JPJC/Prelim/9749/03 2 (a) A satellite of mass 500 kg moves in a circular orbit at constant speed around the Earth, at a radius r of 69.0 10 m× , with a period T . The satellite is then moved such that it proceeds to orbit around the Earth at a new radius of 71.0 10 m× . T he mass of the Earth is 24105.97 kg× and may be assumed to be a point mass at the centre of the Earth. (i) Determine T. T = ...................................... s [2] (i i) Determine the work done required in moving the satellite to its new orbit. work done = ...................................... J [2] (b) (i) Explain why a geostationary satellite must orbit in the equatorial plane. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. ........................................................................................................................... [3] (ii) Explain why geostationary satellites are often used for telecommunication. .................................................................................................................................. .................................................................................................................................. ........................................................................................................................... [1]

7 2023/JPJC/Prelim/9749/03 [Turn over 3 (a) (i) Explain what is meant by the internal energy of a system. .................................................................................................................................. .................................................................................................................................. ............................................................................................................................ [1] (ii) Write the equation representing the first law of thermodynamics, stating the meaning of each of the symbols clearly. .................................................................................................................................. .................................................................................................................................. .................................................................................................................................. ............................................................................................................................ [2] (iii) Explain why the heat ca