2013_NYJC_H2_Physics_P3_Answer

© NYJC 2013 JC2/Prelim/H2/9646/03 [Turn over Candidate Name Class Tutor Name PHYSICS 9646/03 Paper 3 Longer Structured Questions 18 September 2013 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and tutor name on all the work you hand in. Write in dark blue or black pen on both sides of the paper. 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 two questions. 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 26 printed pages Nanyang Junior College NANYANG JUNIOR COLLEGE Science Department JC 2 PRELIMINARY EXAMINATION Higher 2 For examiner’s use Section A 1 2 3 4 5 Section B 6 7 8 Total

NYJC JC2/Prelim/H2/9646/03 2 Data speed of light in free space, c = 3.00 × 108 m s–1 permeability of free space, μ0 = 4π × 10–7 H m–1 permittivity of free space, ε0 = 8.85 × 10–12 Fm–1 (1 / (36π)) × 10–9 Fm–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 + ½at2 v2 = u2 + 2as work done on/by a gas, W = pΔV hydrostatic pressure, p = ρgh gravitational potential,  = –Gm / r displacement of particle in s.h.m. x = x0 sin ωt velocity of particle in s.h.m. v = v0 cos ωt   22 oxx mean kinetic energy of a molecule of an ideal gas E = 3 2 kT resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + … electric potential, V = Q / 4πε0r alternating current/voltage, x = x0 sin ωt transmission coefficient, T  exp(–2kd) where k = 12 0.693 t   2 2 8 m U E h   radioactive decay, x = x0 exp (–λt) decay constant λ = 21 693.0 t

3 © NYJC 2013 JC2/Prelim/H2/9646/03 [Turn over For Examiner’s Use Section A Answer all the questions in this section. 1 Three similarly sized balls A, B, and C, of masses 0.40 kg, 0.20 kg, and 0.10 kg respectively, are connected by strings such that their centre -to-centre distances are as shown in Fig. 1.1 below. The setup is swung in a horizontal circle on a frictionless table about O. The balls and strings maintain a straight line, with the outermost ball having a speed of 6.0 m s–1. Fig. 1.1: Top View Calculate (a) the angular velocity ω of C. ω = .....................