RVHS H2 Physics P3 QP

River Valley High School Page 1 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATIONS H2 PHYSICS 9749 / 3 PAPER 3 13 SEPTEMBER 2022 2 HOURS CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER CLASS 2 1 J INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. FOR EXAMINERS’ USE Section A – do all questions 1 / 6 2 / 9 3 / 7 4 / 8 5 / 9 6 / 5 7 / 8 8 / 8 Section B – do ONE question only 9 / 20 10 / 20 Deduction TOTAL / 80 Read these notes carefully. Write your name, centre number, index number and class in the spaces at the top of this page and on all work you hand in. Candidates answer on the Question Paper. 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 staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer one question only. You are advised to spend one and half hours on Section A and half an hour on Section B. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 25 printed pages.

River Valley High School Page 2 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations Data speed of light in free space, c = 3.00  108 m s–1 permeability of free space, 0 = 4   10–7 H m–1 permittivity of free space, 0 = 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

River Valley High School Page 3 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations Formulae uniformly accelerated motion 2 2 1 atuts += 22 2v u as=+ work done on / by a gas W p V= hydrostatic pressure p gh= gravitational potential  = − GM / r temperature T / K = T / C + 273.15 pressure of an ideal gas = 2 3 1 cV Nmp mean translational kinetic energy of an ideal gas molecule kTE 2 3= displacement of particle in s.h.m., x = x0 sin t velocity of particle in s.h.m., v = v0 cos t = )( 22 0 xx −  electric current, I = Anvq resistors in series, 12R R R= + + resistors in parallel, 121/ 1/ 1/R R R= + + electric potential, r QV 04= alternating current/voltage, x = x0 sin t magnetic flux density due to a long straight wire, dB   2 0I= magnetic flux density due to a flat circular coil, r NB 2 0 I= magnetic flux density due to a long solenoid, InB 0= radioactive decay, x = x0 exp (−t) decay constant, 2 1 2ln t=

River Valley High School Page 4 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations Section A Answer all the questions in the space provided 1 The velocity-time graph in Fig. 1.1 shows the first 1.6 s of the motion of a ball which is thrown vertically downwards at an initial speed of 4.0 m s−1. Fig. 1.1 Fig. 1.1 (a) Calculate the distance travelled by the ball before hitting the ground. distance travelled ………………….. m [2] (b) Determine the maximum height attained by the ball above its original release position after it hits the ground. height = ………………….. m [2] v / m s−1 t / s 0.40 0.80 1.20 1.60 2.00 5.0 10.0 − 5.0 − 10.0

River Valley High School Page 5 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations (c) With reference to Fig. 1.1, determine the magnitude of the acceleration of the ball when it is in the air. acceleration = ………………….. m s−2 [1] (d) Determine the time at which the ball next reaches the ground. time = ………………….. s [1] 2 Block A with mass m and speed of 10 m s−1 collides head-on with block B of mass 5m that has a speed of 2.0 m s−1 in the same direction. (a) After the collision, the block B travels in the original direction with a speed of 4.5 m s−1. (i) Calculate the velocity of the block A immediately after the collision. velocity = ………………….. m s−1 [2]

River Valley High School Page 6 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations (ii) Consider block A and block B as a system. Determine the percentage of kinetic energy lost by the system after the collision. percentage = ………………….. % [3] (b) If no kinetic energy were lost during the collision, determine the velocity of block A and block B immediately after they have collided. velocity of block A = ………………….. m s−1 velocity of block B = ………………….. m s−1 [4]

River Valley High School Page 7 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations 3 Block P of mass 2.0 kg is connected to a spring of spring constant 200 N m−1 that has one end fixed to the wall as shown in Fig. 3.1. Block P is in turn connected to block Q of mass 4.0 kg via an inextensible string. Fig. 3.1 The horizontal surfaces between block P and the table, and the pulley are frictionless. The pulley has negligible mass. The blocks are released from rest with the spring being unstretched. (a) Consider the spring, mass P and Q as a system. State the energy conversion in the system just after block Q starts to move downwards. ................................................................................................................................ ................................................................................................................................ ....................................................................................................................... [1] (b) (i) Calculate the combined kinetic energy of the two blocks when block Q has fallen by 9.0 cm. kinetic energy = ………………….. J [2] P Q spring wall pulley string table

River Valley High School Page 8 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations (ii) Calculate the kinetic energy of the block Q after it has fallen by 9.0 cm. kinetic energy = ………………….. J [2] (c) Determine the distance that block Q has fallen before it first comes to rest. distance = ………………….. cm [2]

River Valley High School Page 9 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations 4 A cyclist made a left turn on a rough level road surface at a constant speed v, as shown in Fig. 4.1 . The total mass of the bicycle and rider is m and their combined centre of gravity is at G. Fig. 4.1 (a) In Fig. 4.1, draw and label all the forces acting on the system of the cyclist and his bicycle. Ignore forces parallel to the direction of motion. [2] (b) If the rider is negotiating a turn with a radius of curvature of 55 m, the total mass of the rider and bicycle is 8 0 kg, and the friction provided by the road surface is 70 N, calculate the speed with which he is turning. speed = ………………….. m s−1 [1]

River Valley High School Page 10 of 25 H2 Physics 9749 2022 JC 2 Preliminary Examinations (c) The rider now makes the same left turn on a rough surface banked a t 20o