NYJC 2021 H2 Physics 9749 P2

NYJC 2021 9749/02/J2Prelim/21 [Turn over NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CLASS TUTOR’S NAME CENTRE NUMBER S INDEX NUMBER PHYSICS 9749/02 Paper 2 Structured Questions 16 September 2021 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class, Centre number and index number 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 a HB pencil for any diagrams, graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Answer all 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. For Examiner’s Use 1 / 8 2 / 8 3 / 8 4 / 10 5 / 10 6 / 10 7 / 6 8 / 20 Total / 80 This document consists of 23 printed pages.

2 NYJC 2021 9749/02/J2Prelim/21 Data speed of light in free space c = 3.00 × 108 m s−1 permeability of free space  = 4 × 10−7 H m−1 permittivity of free space  = 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

3 NYJC 2021 9749/02/J2Prelim/21 [Turn over 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 / K / C 273.15TT    pressure of an ideal gas 21 3 Nmpc V   mean translational kinetic energy of an ideal molecule 3 2E kT displacement of particle in s.h.m. 0 sinx x t  velocity of particle in s.h.m. 0 cosv v t  22 0xx  electric current I Anvq resistors in series 12 . . .R R R   resistors in parallel 121/ 1/ 1/ . . .R R R   electric potential 04 QV r alternating current/voltage 0 sinx x t  magnetic flux density due to a long straight wire   0 2 IB d magnetic flux density due to a flat circular coil  0 2 NIB r magnetic flux density due to a long solenoid  0B nI radioactive decay 0 exp( )x x t  decay constant 1 2 ln2 t 

4 NYJC 2021 9749/02/J2Prelim/21 1 (a) A body has an initial velocity u and an acceleration a. After a time t, the