2022 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 29 September 2022 2 hours READ THESE INSTRUCTIONS FIRST This document consists of 20 printed pages. For Examiner’s Use Paper 1 /25 Paper 2 1 /10 2 /10 3 /10 4 /5 5 /14 6 /10 7 /6 8 /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/22 [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 1 at2 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 o Iμ 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/22 [Turn over 3 Answer all questions. 1 A ball is kicked from horizontal ground towards a vertical wall as shown in Fig. 1.1. Fig. 1.1 (not to scale) The horizontal distance between the initial position of the ball and the base of the wall is 24 m. The ball is kicked with an initial velocity v at an angle of 28 to the horizontal. The ball just hits the top of the wall after a time of 1.5 s. (a) Calculate the horizontal component vX of the velocity of the ball. vX = ………………………… m s–1 [1] (b) Hence, determine the initial vertical component vY of the velocity of the ball. vY = ………………………… m s–1 [2]

©YIJC 9749/02/YIJC/22 [Turn over 4 (c) The ball is kicked at time t = 0. Assume that the vertical component vY of the velocity of the ball is positive in the upwards direction. (i) On Fig. 1.2, sketch the variation with time t of vY for the time between 0 and 1.5 s. Fig. 1.2 [3] (ii) Using Fig. 1.2, determine the maximum height above the ground that the ball reached. maximum height = ………………………… m [2] (iii) When air resistance is not negligible, state and explain the acceleration of the ball at the highest point of its path. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… [2] [Total : 10]

©YIJC 9749/02/YIJC/22 [Turn over 5 2 In a car test, a car with a dummy driver and passenger, moving at a speed of 6.9 m s −1, collides head-on into a wall. The mass es of the car, driver and front passenger are 1250 kg, 85 kg and 65 kg respectively. The average deceleration of the car, as it comes to a stop, is 48 m s−2. Both passenger and driver have their seat belts tightly fastened. (a) Define impulse. ……………………………………………………...……..….………….………..……..……. ……………………………………………………………….….………………...…………… [1] (b) Calculate the magnitude of the average force exerted on the car and its occupants. average force = ………………….. N [1] (c) Determine the magnitude of impulse of the car and its occupants. impulse = ………………….. N s [2] (d) Hence, using answers in (b) and (c), calculate the time taken for the car to come to a stop. time = ………………….. s [2] (e) Assuming that the average deceleration remains the same, state and explain how your answer in (d) will change (if any) when the total mass of car and occupants has doubled. …………...……………………….……………………………….……………..……………. ………………………..…………………………….…………………..……………………… ………………………………………………………………………………...…….….……… …………………………………………………………………………………….…………… [2]

©YIJC 9749/02/YIJC/22 [Turn over 6 (f) Explain if the collision between the car and the wall is elastic. …………………..……………………………………………………..……..…………...…… …………………………………..……………………………………………………………... …………………………………..…………………………………...……….…..………….... [2] [Total : 10]

©YIJC 9749/02/YIJC/22 [Turn over 7 3 (a) A cylinder is made from a material of density 2.7 g cm −3. The cylinder has diameter 2.4 cm and length 5.0 cm. Show that the weight of the cylinder is 0.60 N. [2] (b) The cylinder in (a) is hung with a thread from end A of a non -uniform bar AB, as shown in Fig. 3.1. Fig. 3.1 (not to scale) The length of the bar is 50 cm and its weight is 0.25 N. The centre of gravity of the bar is 20 cm from B. The bar is pivoted at P. The pivot is 12 cm from B. An object X is hung with another thread from end B. The weight of X is adjusted until the bar is horizontal and in equilibrium. (i) Define the moment of a force about a point. …………………………………………………………………..………...…….………….. ………………………………………………………………...…………..…..……………. …………………………………………………………………..………………………….. [2] (ii) Calculate the weight of X. weight of X = …………………….. N [2]

©YIJC 9749/02/YIJC/22 [Turn over 8 (c) The cylinder is now fully immersed in water of density 1.0 g cm−3, as illustrated in Fig. 3.2. Fig. 3.2 (not to scale) An upthrust acts on