TMJC 2023 H2 Physics P2 QP

CANDIDATE NAME ( ) CIVICS GROUP _________________________________________________________________________ H2 PHYSICS 9749/02 Paper 2 Structured Questions 14 September 2023 2 hours Candidates answer on the Question Paper. No Additional Materials are required. _________________________________________________________________________ Section B: Structured Questions READ THESE INSTRUCTIONS FIRST Write your name and Civics Group in the spaces at the top of the page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. ______________________________________________________________________________ This document consists of 22 printed pages. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION For Examiners’ Use 1 / 10 2 / 10 3 / 8 4 / 10 5 / 10 6 / 12 7 / 20 Deduction Total / 80

2 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics Data speed of light in free space c = permeability of free space µo = permittivity of free space ε0 = = elementary charge e = the Planck constant h = unified atomic mass constant u = rest mass of electron me = rest mass of proton mp = molar gas constant R = 8.31 J K−1 mol−1 the Avogadro constant NA = the Boltzmann constant k = gravitational constant G = acceleration of free fall g = 813.00 10 m s −× 714 10 H mπ −−× 12 18.85 10 F m−−× ( )( ) 911/ 36 10 F mπ −−× 191.60 10 C−× 346.63 10 J s−× 271.66 10 kg−× 319.11 10 kg−× 271.67 10 kg−× 23 16.02 10 mol −× 23 11.38 10 J K−−× 11 2 26.67 10 N m kg−−× 29.81 m s−

3 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics Formulae uniformly accelerated motion s = ut + at2 v2 = u2 + 2as work done on / by a gas W = p∆V hydrostatic pressure p = ρgh gravitational potential φ = temperature T /K = T /°C + 273.15 pressure of an ideal gas p = mean translational kinetic energy of an ideal gas molecule E = kT displacement of particle in s.h.m. x = xo sin ωt velocity of particle in s.h.m. v = vo cos ωt = ± ω electric current I = Anvq resistors in series R = … resistors in parallel = … electric potential V = alternating current / voltage X = xo sin ωt magnetic flux density due to a long straight wire B = magnetic flux density due to a flat circular coil B = magnetic flux density due to a long solenoid B = radioactive decay x = decay constant = 1 2 GM r− 21 3 Nm c V 3 2 22 oxx − 12RR++ 1 / R 121/ 1/RR++ 04πε Q r 0 2 d µ π I 0 2 N r µ I 0nµ I ( )0 expxt λ− λ 1 2 ln2 t

4 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics Answer all the questions in the spaces provided. 1 At a training centre, a ski jumper takes off from a ramp. The end of the ramp is 1.0 m above the ground and is at an angle of 10° above horizontal as shown in Fig. 1.1. The ski jumper took 0.80 s, after leaving the ramp, to land on the ground. The air resistance is assumed to be negligible. Fig. 1.1 (a) Show that magnitude of the vertical component of the velocity is 2.67 m s−1 when the ski jumper just leaves the ramp. [1] (b) Calculate the ski jumper’s horizontal component of velocity as she leaves the ramp. horizontal component of velocity = ………………… m s−1 [2] 1.0 m 10°

5 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (c) The measurement of time of flight 0.80 s was found to have an uncertainty of 0.08 s. In addition, a 5% uncertainty was found in the horizontal velocity in (b). Calculate the horizontal distance of the flight together with its uncertainty. horizontal distance of flight = …………………± …………………. m [3] (d) In real life, the effect of air resistance is not negligible. (i) Explain the effect of air resistance on the vertical acceleration of the ski jumper from the moment she leaves the ramp until the highest point of the motion. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….…………………… [3]

6 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (ii) It was observed that during the initial part of her flight, an Olympic ski jumper would lean forward in a V-shaped position, as shown in Fig. 1.2. Fig. 1.2 Suggest why she could reach a further distance by adopting such posture. …………………………………………………………….………………………….. …………………………………………………………….…………………… [1]

7 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics 2 (a) Fig. 2.1 shows a simplified model of a man lifting a suitcase. The spine can be treated as a rigid rod. Fig. 2.1 When the suitcase is lifted, three forces P, Q, and R act on the spine which is in equilibrium. P is the force due to lifting the suitcase, Q is the force exerted by the muscles and R is the force acting on the base of the spine. Fig. 2.2 shows the directions and points of action of only P and Q. Fig. 2.2 (i) State the conditions required for a body to be in equilibrium. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….………………………….. …………………………………………………………….…………………… [2] spine base of spine Q P 12° 70°

8 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (ii) Force R acts at the base of the spine. On Fig. 2.3, draw an arrow to represent the direction of force R. Fig. 2.3 [1] (iii) Calculate the ratio of Q P . Q P = ……………………… [2] (b) The suitcase of mass 11 kg is tied to a light rope that is passed over a pulley as shown in Fig. 2.4. When the man applies a force of 30 N on the rope, the suitcase accelerates horizontally across a rough floor. The frictional force between the suitcase and the rough floor is 8.5 N. Fig. 2.4 base of spine Q P • 30 N 20° rough floor

9 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics (i) Determine the normal contact force acting on the suitcase. normal contact force = ……………………… N [2] (ii) State Newton’s second law of motion. …………………………………………………………….……………………...…… …………………………………………………………….………………………..… …………………………………………………………….………………….… [1] (iii) Determine the horizontal acceleration of the suitcase. horizontal acceleration = ……………………… m s−2 [2]

10 Tampines Meridian Junior College 2023 JC2 Preliminary Examination H2 Physics 3 (a) Define angular velocity. ………………………………………………………………………………………………… …………………………………………………………………………………………... [1] (b) Fig. 3.1 shows the setup for a stunt performance. The stuntman, of mass 65 kg, steps off the platform from rest. He falls freely and catches a handle bar at position X, where the rope is horizontal. He then moves in a circular path until position Y at the bottom of the circle. The rope attached to the handle bar is light and inextensible. The centre of mass of the stuntman is at a position 5.5 m above X. The radius of his ci