EJC Physics 2020 J2 H1 JCT P2 QP

©EJC 2020 8867/02/J2H1MYE/2020 [Turn over EUNOIA JUNIOR COLLEGE JC2 JC2 Mid-Year Examination 2020 General Certificate of Education Advanced Level Higher 1 CANDIDATE NAME CIVICS GROUP 1 9 - REGISTRATION NUMBER PHYSICS Paper 2 Structured Questions 8867/02 June/July 2020 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. 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 use of an approved scientific calculator is expected where appropriate. Section A Answer all questions. Section B Answer one question only. 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. This document consists of 23 printed pages and 1 blank page. For Examiner’s Use Section A 1 8 2 9 3 10 4 8 5 10 6 15 Section B 7 8 20 Total 80

2 ©EJC 2020 8867/02/J2H1MYE/2020 Data Formulae uniformly accelerated motion, s = ut + ½at2 v2 = u2 + 2as resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + … speed of light in free space, c = 3.00 × 10 8 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

3 ©EJC 2020 8867/02/J2H1MYE/2020 [Turn over Section A Answer all the questions in this section in the spaces provided. 1 An aeroplane is flying horizontally at a steady speed of v = 67 m s-1 as shown in Fig. 1.1. A parachutist jumps off the aeroplane and free falls for 80 m before releasing the parachute. Air resistance is negligible before the parachute opens. (a) Deduce the magnitude and direction of the velocity of the parachutist just before the parachute is released. direction of velocity = …………………………………. magnitude of velocity = ………………………. m s-1 [3]

4 ©EJC 2020 8867/02/J2H1MYE/2020 (b) In Fig. 1.1, sketch a possible path representing the parachutist’s trajectory (i) labelled P, and (ii) labelled Q if the effects of air resistance cannot be ignored. [1] (c) Some time after the parachute is released, the parachutist of mass 82 kg reaches a terminal velocity of magnitude 7.0 m s-1 with direction vertically downwards normal to the ground. (i) State the condition that allowed the parachutist to fall at terminal velocity. …………………………………………………………………………………………………………… ………………………………………………………………………….……………………………..[1] (ii) The parachutist loses gravitational potential energy during the fall at terminal velocity. State and explain if the kinetic energy of the parachutist changes. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………[1] (iii) The parachutist lands at terminal velocity and takes 0.25 s to come to a complete rest after making contact with the ground. Calculate the average force experienced by the parachutist during the landing. average force = …………………….. N [2] [Total: 8]

5 ©EJC 2020 8867/02/J2H1MYE/2020 [Turn over 2 (a) State the two conditions for static equilibrium. 1. …………………………………………………………………………………………………………. …………………………………………………………………………………………………………. 2. …………………………………………………………………………………………………………. ………….…………………………………………………………………………………………...[2] (b) Fig. 2.1 below shows a horizontal antenna wire attached to two identical and vertical masts. The weight of each mast is 2000 N. The masts are attached to the ground by means of smooth hinges. A support cable, making an angle of 40° with the vertical, is attached to the mast at a height of 5.0 m. The tension in the support cable is 700 N. (i) Show that the tension in the antenna wire AT is 150 N. [2]

6 ©EJC 2020 8867/02/J2H1MYE/2020 (ii) Find the magnitude and direction of the force F that a hinge exerts on its mast. direction = ……………………………… ….. magnitude = ……………………………..N [3] (c) A bird of weight 10 N perche s on the antenna wire at the mid -point. The antenna wire dips at an angle of 1.5° to the horizontal as shown in Fig. 2.2. Determine the new tension in the antenna wire. tension = …………………….. N [2] [Total: 9]

7 ©EJC 2020 8867/02/J2H1MYE/2020 [Turn over 3 A satellite can orbit the Earth along an east -to-west direction (known as a retrograde orbit) as well as along the west-to-east direction (known as a prograde orbit). (a) (i) A satellite is launched in the west -to-east direction from a launch pad on the Equator to the geostationary orbit. Explain why this launch direction is preferred. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………….…..[2] (ii) The Earth may be considered to be a uniform sphere of radius 6400 km with its mass of 2410 g60 k. × concentrated at its centre. Show that the geostationary satellite is 7159 m3 0 . × above the Earth’s surface. [2] (b) (i) A geostationary satellite orbits above the Earth’s surface possesses kinetic energy and gravitational potential energy. Given that gravitational potential energy of the satellite, E= -GMm R Where G is the gravitational constant, M is the mass of the Earth, m is the mass of the satellite and R is the distance between the centre of Earth and the satellite. Show that the total energy of the satellite is expressed as - GMm 2R . [2]

8 ©EJC 2020 8867/02/J2H1MYE/2020 (ii) Find the total energy of the satellite if the mass of the satellite is 1000 kg. total energy = …………………………. J [1] (iii) Atmospheric drag is very low but nonetheless present at the height where geostationary satellites orbit. Explain, in terms of energy, the impact of atmospheric drag on the subsequent trajectory of geostationary satellites. …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… …………………………………………………………………………………………………………… ……………………………………………………………………………………………..………….[3] [Total: 10]

9 ©EJC 2020 8867/02/J2H1MYE/2020 [Turn over 4 (a) A charged particle of mass m and charge + q is travelling with velocity v in a vacuum. It enters a region of uniform magnetic field of flux density B as shown in Fig. 4.1. Describe and explain the path of the particle in the magnetic field and after it leaves the magnetic field. ………………………………………………………………………………….………………………………. ………………………………………………………………………………………………………………….. ………………………………………………………………………………………………………………….. ………………………………………………………………………………………………………………….. ……………………………………………………………………………………………………………….[2] (b) A uniform magnetic field in region PQRS is normal to the page, as shown in Fig. 4.2. At point X, an interaction causes two particles to form which then move along the paths shown. (i) Suggest why each of the paths is a spiral. …………………………………………………………………………………………………………… ………………………………………………………………….……………………………………….. ………………………………………………………………….……………………………………….. ……………………………………………………………….………………………………………..[2]

10 ©EJC 2020 8867/02/J2H1MYE/2020 (iii) State and explain what can be deduced from the paths