NJC_2024_H1_Physics_Prelim_P2_QP

[Turn over NATIONAL JUNIOR COLLEGE SENIOR HIGH 2 PRELIMINARY EXAMINATION Higher 1 CANDIDATE NAME SUBJECT CLASS REGISTRATION NUMBER PHYSICS Paper 2 Structured Questions Candidate answers on the Question Paper. 8867/02 27 August 2024 2 hours No Additional Materials are required. READ THE INSTRUCTION FIRST Write your subject class, registration number and name 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 or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answers all questions. Section B Answer any one question. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A 1 / 8 2 / 5 3 / 8 4 / 16 5 / 6 6 / 10 7 / 7 Section B 8 / 20 9 / 20 Total (80) H

2 This document contains 24 printed pages and 4 blank pages.

3 [Turn over Data speed of light in free space, c = 3.00 × 108 m s–1 elementary charge, e = 1.60 × 10–19 C 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 the Avogadro constant NA = 6.02 × 1023 mol–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 + at2 v2 = u2 + 2as resistors in series R = R1 + R2 + ….. resistors in parallel 1/R = 1/R1 + 1/R2 + …..

4 Section A Answer all the questions in this section. 1 An object is launched at a speed of 30 m s -1 at an angle of 60 ° above the ground as shown in Fig. 1.1. Ignore air resistance. (a) Show that the time taken for the object to reach its maximum height is 2.65 s. [1] (b) Calculate the time taken for the object to hit the ground. time = ………………… s [1] (c) Hence or otherwise, calculate the horizontal distance travelled by the object from the point of launch to the point it first hits the ground.

5 [Turn over horizontal distance = ………………… m [2] (d) On Fig. 1.2, sketch the variation with time t of the vertical component of the velocity vy from the time it leaves the ground to the time it hits the ground. [2]

6 (e) On Fig. 1.3, sketch the variation with time of (i) the horizontal component of the velocity of the object for the duration of time in flight. Label this line A. [1] (ii) the horizontal component of the velocity of the object for the duration of time in flight if air resistance is not negligible. Label this line B. [1] [Total: 8]

7 [Turn over 2 An aeroplane of mass 1.5 x 10 5 kg moves horizontally with constant velocity. Fig. 2.1 shows the forces exerted