TMJC 2023 H2 Physics P3 QP

CANDIDATE NAME ( ) CIVICS GROUP _________________________________________________________________________ H2 PHYSICS 9749/03 Paper 3 Longer Structured Questions 21 September 2023 2 hours Candidates answer on the Question Paper. No Additional Materials are required. _________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name and Civics Group in the spaces at the top of the page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer one question only. The number of marks is given in brackets [ ] at the end of each question or part question. ______________________________________________________________________________ This document consists of 28 printed pages. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION For Examiner’s Use Percentage Subtotal P1 / 15 Subtotal P2 / 30 Paper 3 1 / 8 2 / 16 3 / 9 4 / 15 5 / 12 6 / 20 7 / 20 Deduction Subtotal P3 / 35 Subtotal P4 / 20 Grand total / 100

2 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics Data speed of light in free space c = permeability of free space µo = permittivity of free space ε0 = = elementary charge e = the Planck constant h = unified atomic mass constant u = rest mass of electron me = rest mass of proton mp = molar gas constant R = 8.31 J K−1 mol−1 the Avogadro constant NA = the Boltzmann constant k = gravitational constant G = acceleration of free fall g = 813.00 10 m s −× 714 10 H mπ −−× 12 18.85 10 F m−−× ( )( ) 911/ 36 10 F mπ −−× 191.60 10 C−× 346.63 10 J s−× 271.66 10 kg−× 319.11 10 kg−× 271.67 10 kg−× 23 16.02 10 mol −× 23 11.38 10 J K−−× 11 2 26.67 10 N m kg−−× 29.81 m s−

3 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics Formulae uniformly accelerated motion s = ut + at2 v2 = u2 + 2as work done on / by a gas W = p∆V hydrostatic pressure p = ρgh gravitational potential φ = temperature T /K = T /°C + 273.15 pressure of an ideal gas p = mean translational kinetic energy of an ideal gas molecule E = kT displacement of particle in s.h.m. x = xo sin ωt velocity of particle in s.h.m. v = vo cos ωt = ± ω electric current I = Anvq resistors in series R = … resistors in parallel = … electric potential V = alternating current / voltage X = xo sin ωt magnetic flux density due to a long straight wire B = magnetic flux density due to a flat circular coil B = magnetic flux density due to a long solenoid B = radioactive decay x = decay constant = 1 2 GM r− 21 3 Nm c V 3 2 22 oxx − 12RR++ 1 / R 121/ 1/RR++ 04πε Q r 0 2 d µ π I 0 2 N r µ I 0nµ I ( )0 expxt λ− λ 1 2 ln2 t

4 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics Section A Answer all questions in this section in the spaces provided. 1 A toy car collides into a fixed wall and rebounds with the same speed as shown in Fig. 1.1. Fig. 1.1 (a) (i) State the type of collision that occurred between the car and the wall. …………………………………………………………….…………………… [1] (ii) During the collision the momentum of the car changes. State and explain whether momentum is conserved in this collision. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….…………………… [2] (b) Fig. 1.2 shows the variation with time of the magnitude of force acting on the toy car due to the wall during the collision. Take rightwards as positive. Fig. 1.2 force / N time / s 0 0.18 −15 before the crash: after the crash:

5 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (i) Determine the magnitude of the initial momentum of the car. initial momentum = ……………………… kg m s−1 [2] (ii) The mass of the toy car is 0.65 kg. Determine the magnitude of average acceleration of the toy car during the collision. average acceleration = ……………………… m s−2 [2] (iii) A rubber bumper is now secured to the front of the toy car. T he toy car undergoes a similar collision with the wall. On Fig. 1.2, sketch a new graph showing the variation with time of the force acting on the toy car. [1]

6 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics 2 (a) State what is meant by a field of force. ...………………………………………………………………………………………………. ...……………………………………………………………………………...………… [1] (b) State one similarity and one difference between gravitational field and electric field. Similarity: .…..………………………………………………………………………………. ...………………………………………………………………………………………………. Difference: ………………………………………………………………………………...… ...……………………………………………………………………………...………… [2] (c) Fig. 2.1 shows the variation of the gravitational potential φ between the Moon and the Earth with distance from the centre of the Moon. (i) Point P is a point along the line between the centres of the Moon and the Earth. Explain why point P is closer to the Moon than to the Earth. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….…………………… [2] 0 - 1.3 Earth Moon φ / 106 J kg−1 - 62.3 - 3.9 Fig. 2.1 P distance

7 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (ii) The distance between the centres of the Earth and the Moon is 3.80 × 108 m. Fig. 2.2 shows the values of the radius R and mass M of the Earth and Moon. R I m M l kg Earth 6.37 × 106 5.98 × 1024 Moon 1.74 × 106 7.35 × 1022 Fig. 2.2 Show that the distance from the centre of the Moon to point P is 3.79 × 107 m. [2] (iii) NASA intends to project a space probe from the Earth to the Moon. Determine the minimum projection speed. Explain your answer. speed = ……….……………… m s−1 …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….…………………… [3]

8 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (d) Two small spherical charged particles P and Q are fixed in their positions at 5.0 cm apart in a vacuum. An electron is moved along the line joining the two charges as shown in Fig. 2.3. Fig. 2.3 The variation with the displacement x of electron from P of the electric potential energy Ep of the electron is shown in Fig. 2.4. Fig. 2.4 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 4.0 5.0 0.005 0.010 0.015 0.020 0.025 0.030 0.035 0.040 0.045 5.0 cm Ep / eV x / m P x Q

9 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (i) State and explain which charge P or Q is negatively charged. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….…………………… [2] (ii) Use Fig. 2.4 to estimate the magnitude of the force acting on the electron when it is at the point x = 3.0 cm. force = ……….……………… N [3] (iii) On Fig. 2.4, sketch a new graph if the m