2023 YIJC JC1 H2 Phy Promo Exam Paper 2 Question Paper

YISHUN INNOVA JUNIOR COLLEGE JC 1 PROMOTIONAL EXAMINATION Higher 2 CANDIDATE NAME CG INDEX NO PHYSICS Paper 2 Structured Questions Candidates answer on the Question Paper. No Additional Materials are required. 9749/02 28 September 2023 2 hours READ THESE INSTRUCTIONS FIRST This document consists of 23 printed pages and 5 blank pages. For Examiner’s Use Paper 1 /25 Paper 2 1 /10 2 /10 3 /8 4 /5 5 /5 6 /12 7 /9 8 /6 9 /10 Penalty /75 Overall (Paper 1 & 2) Percentage (%) Write your name and class in the spaces at the top of this page. 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, highlighters, glue or correction fluid/tape. The use of an approved scientific calculator is expected, where appropriate. Answer all questions. At the end of the exa mination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question.

©YIJC 9749/02/YIJC/23 [Turn over 2 Data speed of light in free space, c = 3.00  108 m s–1 permeability of free space, o = 4  10–7 H m–1 permittivity of free space, o = 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 Formulae uniformly accelerated motion, s = ut + 2 1at2 v2 = u2 + 2as work done on/by a gas, W = pV hydrostatic pressure, p =  g h gravitational potential,  = r Gm temperature, T/K = T/°C + 273.15 pressure of an ideal gas, p = 2CV Nm 3 1 mean translational kinetic energy of an ideal gas molecule, E = kT2 3 displacement of particle in s.h.m. x = xo sin  t velocity of particle in s.h.m., v = vo cos  t =   )( 22 xxo  electric current, I = A n v q resistors in series, R = R1 + R2+………. resistors in parallel, R 1 = ........11 21  RR electric potential, V = r Q o4 alternating current/voltage, x = xo sin  t magnetic flux density due to a long straight wire, B = dπ2 oIμ magnetic flux density due to a flat circular coil, B = r2 No Iμ magnetic flux density due to a long solenoid, B = Ion radioactive decay, x = xo exp(–t) decay constant,  = 2 1t 2 ln

©YIJC 9749/02/YIJC/23 [Turn over 3 Answer all questions. 1 A ship at rest, located distance D away from the foot of a tower needs to receive an important piece of landing equipment from the top of the tower. For this equipment to land at the front of the ship's deck, the equipment is thrown at 15.0 m s−1 at 60° above the horizontal from the top of a tower at the edge of the water, 8.75 m above the ship's deck as shown in Fig. 1.1. Fig. 1.1 (a) Assuming that air resistance is negligible, (i) determine the time of flight of the equipment. time = ………………... s [2] (ii) hence determine the value of D. D = ………………... m [2]

©YIJC 9749/02/YIJC/23 [Turn over 4 (b) If air resistance is not negligible, explain how D would be affected. ………………………………………………………………………………………………..…………... ………………………………………………………………………………………………..…………... ………………………………………………………………………………………………………… [2] (c) Sketch and label clearly on the same axes in Fig 1.2, a graph to show the variation with time t of the vertical component of velocity Vy of the equipment during its flight if (i) air resistance is negligible. Label the graph as (i). (ii) air resistance is not negligible. Label the graph as (ii). For both graphs, take upwards direction as positive. Fig. 1.2 [4] [Total: 10]

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©YIJC 9749/02/YIJC/23 [Turn over 6 2 (a) State Newton’s second law of motion. ……………………………………………………………………………………………………………. ………………………………………………………………………………………………………… [1] (b) A skydiver jumps from a hovering helicopter. Explain briefly why the acceleration of the skydiver decreases with time. ……………………………………………………………………………………………………………. ……………………………………………………………………………………………………………. ………………………………………………………………………………………………………… [2] (c) The variation with time t of the vertical speed v of the skydiver is shown in Fig. 2.1. Fig. 2.1

©YIJC 9749/02/YIJC/23 [Turn over 7 (i) In Fig. 2.2, draw and label the forces acting on the skydiver and his equipment at t = 4.0 s. Fig. 2.2 [1] (ii) The skydiver and his equipment have a total mass of 80 kg. Use Fig. 2.1 to show that, for the skydiver and his equipment, the net force is approximately equal to 190 N at time t = 4.0 s. [2] (iii) Use your answer in (ii) to determine the total resistive force acting on the skydiver at time t = 4.0 s. total resistive force =…………………... N [2] skydiver and equipment

©YIJC 9749/02/YIJC/23 [Turn over 8 (iv) When the skydiver opens his parachute, explain what happens to the direction of the resultant force on him and how it helps to reduce injury on him upon landing. ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... …………………… …………………………………………………………………………….. [2] [Total: 10]

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©YIJC 9749/02/YIJC/23 [Turn over 10 3 (a) Explain what is meant by the moment of a force. ……………………………………………………………………………………………………………. ………………………………………………………………………………………………………… [1] (b) Fig. 3.1 shows a flat metal sheet bird sculpture created by an artist. Fig. 3.1 M is the centre of mass of the bird sculpture, including its tail (but not including the counter-weight that will be added later). The mass of the bird sculpture is 1.50 kg. The bird sculpture is placed on a fricionless pivot. The artist then adds the counter -weight at the end of the tail at E so that the bird remains stationary in the position shown in Fig. 3.1. (i) Calculate the mass of the counter-weight. mass = ……………… …... kg [2]