2013_PJC_H2_Physics_P3

2013/PJC/PHYSICS/9646 [Turn over PIONEER JUNIOR COLLEGE JC2 Preliminary Examination PHYSICS 9646/03 Higher 2 Paper 3 Longer Structured Questions 24 September 2013 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. 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. You are advised to spend about one hour on each section. 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 23 printed pages. Name Class Index Number For Examiner’s Use 1 / 8 2 / 8 3 / 8 4 / 8 5 / 8 6 / 20 7 / 20 8 / 20 Total / 80

2 2013/PJC/PHYSICS/9646 Data speed of light in free space, 81000.3 c ms–1 permeability of free space, 7 0 104   Hm–1 permittivity of free space, 12 0 1085.8  Fm–1    910361   Fm–1 elementary charge, 191060.1 e C the Planck constant, 341063.6 h Js unified atomic mass constant, 271066.1 u kg rest mass of electron, 311011.9 em kg rest mass of proton, 271067.1 pm kg molar gas constant, 31.8R JK–1 mol–1 the Avogadro constant, 231002.6 AN mol–1 the Boltzmann constant, 231038.1 k JK–1 gravitational constant, 111067.6 G Nm2 kg–2 acceleration of free fall, 81 .9g ms–2

3 2013/PJC/PHYSICS/9646 [Turn over Formulae uniformly accelerated motion, 2 2 1 atuts  asuv 222  work done on/by a gas, VpW  hydrostatic pressure, ghp  gravitational potential, r Gm displacement of particle in s.h.m., txx sin0 velocity of particle in s.h.m., tvv cos0 22 0 xx   mean kinetic energy of a molecule kTE 2 3 of an ideal gas, resistors in series, ... 21  RRR resistors in parallel, ... /1/1/1 21  RRR electric potential, r QV 04 alternating current/voltage, txx sin0 transmission coefficient,  kdT 2exp  where   2 28 h EUmk   radioactive decay, ) exp( 0 txx  decay constant, 2 1 693.0 t

4 2013/PJC/PHYSICS/9646 Section A Answer all questions in this section. 1 A ball is thrown vertically upwards with a velocity of 25 m s −1 from ground level and then falls back to its starting point. Fig. 1.1 shows the variation with time of the velocity of the ball.