EJC 2022 J1 H2 PROMO QP PAPER 2

©EJC 2022 9749/J1H2PROMO/2022 [Turn over EUNOIA JUNIOR COLLEGE JC1 PROMO EXAMINATIONS 2022 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 2 - REGISTRATION NUMBER PHYSICS Structured Questions 9749/02 4th October 2022 2 hours READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. The use of an approved scientific calculator is expected where appropriate. Answer all questions. 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 paper clips, highlighters, glue or correction fluid. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 24 printed pages and 4 blank pages. For Examiner’s Use Q1 4 Q2 12 Q3 11 Q4 10 Q5 8 Q6 6 Q7 9 Q8 7 Q9 4 Q10 9 s.f. P2 Total 80

2 ©EJC 2022 9749/J1H2PROMO/2022 Data speed of light in free space, ( )( ) 81 71 0 12 1 0 91 19 34 27 31 e 27 p 11 23 1 A 23 1 10 m s 10 H m 10 F m 10 F m 10 C 6 63 10 J s 1 3 00 4 8 85 1 36 1 60 9 11 1 67 66 10 kg 10 kg 10 kg J K mol 6 02 10 8 31 1 38 mol 10 J K c. . / e h. u. m m . . . R. N k . . G ε µπ π − −− −− −− − − − − − −− − −− × × × × × = × = = = × × × = × = = = = = = = × 11 2 2 2 10 N m kg m 67 81 s 6 9 . g. −− − = = × permeability of free space, permittivity of free space, elementary charge, the Planck constant, unified atomic mass constant, rest mass of electron, rest mass of proton, molar gas constant, the Avogadro constant, the Boltzmann constant, gravitational constant, acceleration of free fall,

3 ©EJC 2022 9749/J1H2PROMO/2022 [Turn over Formulae uniformly accelerated motion, ( ) ( ) 2 22 2 0 0 22 0 12 12 0 0 0 0 0 0 1 2 1 2 2 / K / C 273 15 1 3 3 2 sin cos 111 4 sin 2 2 exp ln2 at u as V p gh Gm r TT . Nmpc V kT xx t vv t xx R /R /R /R QV r xx t B d NB r s ut v Wp t E Bn t Anvq RR xx ρ φ ω ω ω πε ω µ π µ µ λ λ = + ∆ = =− = °+ = = = = ±− ++ =++ = = = = = − = = + = = = = = I I I I   work done on/by a gas, hydrostatic pressure, gravitational potential, temperature, pressure of an ideal gas, mean translational kinetic energy of an ideal gas molecule displacement of particle in s.h.m. velocity of particle in s.h.m. electric current, resistors in series, resistors in parallel, electric potential, alternating current/voltage, magnetic flux density due to a long straight wire magnetic flux density due to a flat circular coil magnetic flux density due to a long solenoid radioactive decay, decay constant

4 ©EJC 2022 9749/J1H2PROMO/2022 1 The velocity v of the falling ball can be obtained by using the following equation as shown below. 2 9 ball liquid2 ρρμ= gr v −  In an experiment to determine v, the following values were recorded in the laboratory: viscosity of the liquid, μ = 3.8 ± 0.1 Pa s gravitational acceleration on Earth, g = 9.81 m s−2 (assume no uncertainty) radius of the ball, r = 0.06 ± 0.01 m density of the ball, ballρ = 7000 ± 50 kg m−3 density of the falling ball liquid, liquidρ = 1250 ± 20 kg m−3 (a) Calculate the absolute uncertaintyΔvof velocity v . Δv = ……………………… m s−1 [2] (b) Using your answers in (a), determine the value of v together with its associated uncertainty. v± Δv= ………………… ± ……………… m s−1 [2] [Total: 4]

5 ©EJC 2022 9749/J1H2PROMO/2022 [Turn over 2 (a) A ball is fired on an unknown planet at an elevation angle of 20° from the horizontal as shown in Fig 2.1 and the motion of the ball follows that of a projectile motion. The ball lands on a target which is at the same height as when it is fired. The initial horizontal velocity of the ball is 8.0 m s−1 and the horizontal distance between the initial position of the ball and the target is 10 m. You may ignore air resistance. Fig. 2.1 Determine the gravitational acceleration on the unknown planet. gravitational acceleration = ………………………m s −2 [3] 20° 10 m target

6 ©EJC 2022 9749/J1H2PROMO/2022 (b) Fig 2.2 shows the displacement-time graph for a car on a road. Fig. 2.2 Describe the motion of the car at each stage. ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ………………………………………………………………………………………………….. [3] t3 t2 t1 0 time displacement

7 ©EJC 2022 9749/J1H2PROMO/2022 [Turn over (c) Fig 2.3 shows the variation of velocity with time t of a car travelling on a road for the first 22 s. Sketch the corresponding displacement-time graph and acceleration-time graph of the car in the graphs provided below. For the displacement-time graph, state the displacement at 22 s clearly on the axis. For the acceleration-time graph, state all accelerations clearly on the axis. [6] [Total: 12] Fig. 2.3 22 18 16 12 7 -12 0 15 t / s velocity / m s−1 3 0 0 t / s acceleration/ m s−2 t / s displacement / m

8 ©EJC 2022 9749/J1H2PROMO/2022 3 A 50 kg barn door of uniform density has a width and a length of 0.70 m and 1.5 m respectively. (a) It is hung by two ropes A and B as shown in Fig 3.1. One edge of the door is in contact with a vertical rough wall. Rope B is vertical and is experiencing a tension of 200 N. The horizontal distances from the centre of gravity CG and rope B to the wall are 0.80 m and 1.6 m respectively. Fig. 3.1 (i) Determine the magnitude of tension in rope A. tension in rope A = ………………………N [3] 1.5 m 0.70 m 30o 10 o rope A rope B 1.6 m CG 0.80 m

9 ©EJC 2022 9749/J1H2PROMO/2022 [Turn over (ii) Determine the magnitude of the normal contact force by the wall on the barn door. normal contact force = ………………………N [2] (iii) Determine the magnitude of the friction by the wall on the barn door. friction = ………………………N [2]

10 ©EJC 2022 9749/J1H2PROMO/2022 (b) Rope A breaks and part of the door falls into water of density 1000 kg m −3 as shown in Fig 3.2. The total volume of the door is 0.16 m3 Fig. 3.2 (i) Calculate the magnitude of the upthrust experienced by the door. upthrust = ………………………N [2] (ii) Hence, calculate the magnitude of the tension in rope B. tension in rope B = ………………………N [2] [Total: 11] 0.60 m 0.15 m 0.70 m