RVHS H2 Physics P3 QP

River Valley High School Page 1 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATIONS H2 PHYSICS 9749 / 03 PAPER 3 13 SEPTEMBER 2024 2 HOURS CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER CLASS 2 3 J INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. FOR EXAMINERS’ USE Section A – do all questions 1 / 8 2 / 4 3 / 7 4 / 7 5 / 12 6 / 8 7 / 8 8 / 6 Section B – do ONE question only 9 / 20 10 / 20 Deduction TOTAL / 80 Read these notes carefully. Write your name, centre number, index number and class in the spaces at the top of this page and on all work you hand in. Candidates answer on the Question Paper. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. 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. You are advised to spend one and half hours on Section A and half an hour on Section B. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 24 printed pages.

River Valley High School Page 2 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations Data speed of light in free space, c = 3.00  108 m s–1 permeability of free space, 0 = 4   10–7 H m–1 permittivity of free space, 0 = 8.85  10–12 F m–1 = (1/(36  ))  10–9 F m–1 elementary charge, e = 1.60  10–19 C the Planck constant, h = 6.63  10–34 J s unified atomic mass constant, u = 1.66  10–27 kg rest mass of electron, me = 9.11  10–31 kg rest mass of proton, mp = 1.67  10–27 kg molar gas constant, R = 8.31 J K–1 mol–1 the Avogadro constant, NA = 6.02  1023 mol–1 the Boltzmann constant, k = 1.38  10–23 J K–1 gravitational constant, G = 6.67  10–11 N m2 kg–2 acceleration of free fall, g = 9.81 m s–2

River Valley High School Page 3 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations Formulae uniformly accelerated motion 21 2s ut at=+ 22 2v u as=+ work done on / by a gas W p V= hydrostatic pressure p gh= gravitational potential  = − GM / r temperature T / K = T / C + 273.15 pressure of an ideal gas = 2 3 1 cV Nmp mean translational kinetic energy of an ideal gas molecule kTE 2 3= displacement of particle in s.h.m., x = x0 sin t velocity of particle in s.h.m., v = v0 cos t = )( 22 0 xx − electric current, I = Anvq resistors in series, 12R R R= + + resistors in parallel, 121/ 1/ 1/R R R= + + electric potential, r QV 04= alternating current/voltage, x = x0 sin t magnetic flux density due to a long straight wire, dB   2 0I= magnetic flux density due to a flat circular coil, r NB 2 0 I= magnetic flux density due to a long solenoid, InB 0= radioactive decay, x = x0 exp (−t) decay constant, 2 1 2ln t=

River Valley High School Page 4 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations Section A Answer all the questions in the spaces provided. 1 (a) A ball is projected with a horizontal velocity of 1.1 m s−1 from point A at the edge of a table, as shown in Fig. 1.1. Fig. 1.1 The ball lands on horizontal ground at point B which is 0.43 m away from the base of the table. Air resistance is assumed to be negligible. (i) Calculate the time taken for the ball to fall from A to B. time = …………………. s [1] (ii) Use your answer in (a)(i) to determine the height of the table. height = …………………. m [2] horizontal ground path of ball table ball 0.43 m 1.1 m s−1

River Valley High School Page 5 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations (ii) Determine the angle that the path of the ball makes to the horizontal when it reaches B. angle = …………………. ° [2] (iv) The ball leaves the table at time t = 0. For the motion of the ball between A and B, sketch graphs on Fig. 1.2 to show the variation with time t of 1. the acceleration a of the ball, 2. the vertical component sv of the displacement of the ball from A. Numerical values are not required. Fig. 1.2 [2] (b) A ball of greater mass is projected from the table with the same velocity as the ball in (a). Air resistance is still assumed to be negligible. State and explain the effect, if any, of increased mass on the time taken for the ball to fall to the ground. …………………………………………………………………………………………… …………………………………………………………………………………… [1] a sV

River Valley High School Page 6 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations 2 Fig. 2.1 shows a body P supported by 3 wires under tension. The tension in each wire is represented by T1, T2 and T3. Body Q sits on a flat surface. Fig. 2.2 shows the side view of the 2 structures. The mass of body P is 350 g, and acts at a point along a vertical that is 14.5 cm away from wires under tension T1 and T2. (a) On Fig. 2.1, draw arrows to indicate the direction of tensile forces in each of the 3 wires acting on body P. [1] (b) At equilibrium, the magnitude of tensile forces in wire 1 and wire 2 is the same, 12 = T T . Determine the magnitude of T3. T3 = …………………. N [2] (c) Without further calculation, explain which of the wire(s) is/are more likely to break if a further load is placed onto the structure at location R. …………………………………………………………………………………………… …………………………………………………………………………………… [1] Q Fig. 2.1 Fig. 2.2 centre of mass P 20.0 cm 14.5 cm 10.0 cm R R P

River Valley High School Page 7 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations 3 Fig. 3.1 shows a marble falling onto a spring when released from height of 6.0 cm above the top of the spring. The maximum compression of the spring is 5.0 cm. The spring obeys Hooke’s law and has a spring constant of 25 N m −1. You may assume that air resistance is negligible. (a) By using the principle of conservation of energy, show that the mass of the ball is 0.029 kg. [1] (b) Explain, in terms of forces, why the speed of the marble continues to increase for a period of time after hitting the surface of the spring. ................................................................................................................................ ................................................................................................................................ ................................................................................................................................ ………............................................................................................................ [2] (c) Hence, determine the maximum kinetic energy of the marble. energy = ……………………………. J [4] 6.0 cm 5.0 cm maximum compression of spring ball just released Fig. 3.1

River Valley High School Page 8 of 24 H2 Physics 9749 2024 JC 2 Preliminary Examinations 4 Fig. 4.1 shows the path of a charged particle in a uniform magnetic field. Fig. 4.1 (a) Explain why the charged particle travels in a circular path. ................................................................................................................................ ................................................................................................