MI 2024 PU3 H2 PHYSICS PRELIM P2 QP

Class Adm No Candidate Name: This document consists of 21 printed pages and 1 blank page. [Turn over 2024 Preliminary Exams Pre-University 3 H2 PHYSICS 9749/02 Paper 2 Structured Questions 12 September 2 hours Candidates answer on the Question Paper No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Do not turn over this page until you are told to do so. Write your full name, class and Adm number in the spaces at the top of this page. Write in dark blue or black pen on both sides of this booklet. 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. Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question . For Examiner’s Use 1 / 12 2 / 11 3 / 13 4 / 7 5 / 10 6 / 7 7 / 20 Presentation Total / 80

2 Data speed of light in free space c = 3.00  108 m s–1 permeability of free space o = 4 10–7 H m–1 permittivity of free space o = 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–1mol–1 the Avogadro constant NA = 6.02  1023mol–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

3 [Turn over Formulae uniformly accelerated motion s = ut + at2 v2 = u2 + 2as work done on/by a gas W = p V hydrostatic pressure p =  g h gravitational potential  = temperature T/K = T / °C + 273.15 pressure of an ideal gas p = 1 3 𝑁𝑚 𝑉 < 𝑐2 > mean kinetic energy of a molecule of an ideal gas E = displacement of particle in s.h.m. x = xo sin t velocity of particle in s.h.m. v = vo cost v =  electric current I = Anvq resistors in series R = R1 + R2 + … resistors in parallel = electric potential V = alternating current/voltage x = xo sin t magnetic flux density due to a long straight wire B = 𝜇𝑜𝐼 2𝜋𝑑 magnetic flux density due to a flat circular coil B = 𝜇𝑜𝑁𝐼 2𝑟 magnetic flux density due to a long solenoid B = onI radioactive decay x = x0exp(–t) decay constant,  = 𝑙𝑛2 𝑡1/2 2 1  r Gm− kT2 3 )( 22 xxo − R 1 ...11 21 ++ RR r Q 04

4 Answer all questions in the spaces provided. 1 A ball is thrown from the ground and follows the path shown in Fig. 1.1. The ground is horizontal. The effect of air resistance is negligible. Fig. 1.1 (not to scale) (a) (i) Describe the variation in the vertical velocity and the vertical acceleration of the ball throughout the path. …...……………………………………….…………..…………………………………….….… …...……………………………………….…………..…………………………………….….… …...……………………………………….…………..…………………………………….….… …...……………………………………….…………..…………………………………….….… …...……………………………………….…………..…………………………………….….… …...……………………………………….…………..…………………………………….….… .……………………………………………….…………..………………………….………..… .……………………………………………….…………..………………….……….……….[3] (ii) Describe the variation in the horizontal velocity and the horizontal acceleration of the ball throughout the path. …...……………………………………….…………..…………………………………….….… …...……………………………………….…………..…………………………………….….… .……………………………………………….…………..………………………….………..… .……………………………………………….…………..………………….……….……….[2]

5 [Turn over (b) (i) The initial velocity of the ball is 15 m s-1 at an angle of 20o to the horizontal. Calculate the horizontal distance travelled by the ball before hitting the ground. horizontal distance = ........................... m [3] (ii) The ball is now thrown at the same speed and angle from a cliff edge. The cliff height is 70 m. Calculate the extra horizontal distance travelled by the ball before hitting the ground when thrown from the cliff edge. extra horizontal distance = ........................... m [4] [Total: 12]

6 2 This question is about the gravitational field around Mars. Fig. 2.1 shows some equipotential lines around Mars. The mass of Mars is 6.4 x 1023 kg and the radius of Mars is 3.4 x106 m. Fig. 2.1 (a) Define gravitational field strength at a point. .……………………………………………….…………..…………………………………...……….… .……………………………………………….…………..………………………………….……….. [1] (b) State how Fig. 2.1 shows that the gravitational field strength decreases as the distance from the surface of the Mars increases. .……………………………………………….…………..………………………………….……..….… .……………………………………………….…………..………………………………….……….. [1] (c) A spacecraft at point X drops a satellite, of mass 90 kg, from rest onto the surface of Mars. Calculate the velocity of the satellite when it reaches point Y. velocity = ........................... m s-1 [2] -6.0 MJ kg-1 -8.0 MJ kg-1 -10.0 MJ kg-1 •Y Mars

7 [Turn over (d) The satellite reaches the geostationary orbit of Mars. Fig. 2.2 shows this satellite orbiting at a height of 1.7 x 107 m above the surface of Mars. (i) Calculate the period of the satellite in the geostationary orbit. period = ........................... h [3] (ii) Calculate the kinetic energy of the satellite in this orbit. kinetic energy = ........................... J [2] (iii) Assuming that the satellite experiences friction as it orbits around Mars, explain in terms of conservation of energy, what happens to the kinetic energy of the satellite. …...……………………………………….…………..…………………………………….….… .……………………………………………….…………..………………………….………..… .……………………………………………….…………..………………….……….……….[2] [Total: 11] Fig. 2.2

8 3 (a) Explain why steam at 100 C causes a more severe burn than the same mass of boiling water at 100 C . .……………………………………………….…………..…………………………………...……….… .……………………………………………….…………..…………………………………...……….… .……………………………………………….…………..………………………………….………..[2] (b) A fixed mass of monoatomic ideal gas undergoes a cycle of changes in pressure, volume and temperature, as shown in Fig. 3.1. The temperatures of the gas at A and D are 800 K and 226 K respectively. Fig. 3.1 (i) Calculate the amount of gas, in moles. amount of gas = .............................. mol [2] (ii) For the constant-pressure expansion from A to B, calculate 1. the temperature at B, temperature = ........................... K [1] A B C p/ 105 Pa V/ 10−4 m3 1.2 5.2 8.0 Fig. 7.1 0.85 D 20

9 [Turn over 2. the increase in internal energy, increase in internal energy = ........................... J [2] 3. the work done on the gas, work done on gas = ........................... J [2] 4. the heat supplied to the gas, heat supplied to gas = ........................... J [1] (iii) For each of the changes from B to C and from D to A, there is no heat exchange with the surrounding. The work done by the gas from B to C is 390 J. Calculate the net work done by the gas in one cycle. net work done by the gas = ........................... J [3] [Total: 13]

10 4 (a) State how a polarised transverse wave differs from an unpolarised transverse wave. .……………………………………………….…………..………………………………….……..….… .……………………………………………….…………..………………………………….…..…….… .……………………………………………….…………..………………………………….….……..[1] (b) Light is polarised when it passes through a sheet material known a