ACSI 2024 Promo HL Phys P2

This paper consists of 22 printed pages. END-OF-YEAR EXAMINATION 2024 YEAR 5 IB DIPLOMA PROGRAMME PHYSICS (HIGHER LEVEL) PAPER 2 Wednesday 18 September 2024 2 hours 30 minutes INSTRUCTIONS TO STUDENTS Write your index number in the box provided on the top right corner of this page. Do not open this booklet until you are told to do so. There are 10 questions in this paper. Answer all the questions. INFORMATION FOR STUDENTS The number of marks is given in brackets [ ] at the end of each question or part question. The maximum mark for this examination paper is [90 marks]. Calculators are allowed for this paper. Data booklet will be provided. Answer all the questions in the spaces provided. Marks Awarded Section Marks 1 2 3 4 5 6 7 8 9 10 Sig. Fig. Units TOTAL SCORE Index Number Name

2 1. A plane is flying horizontally at a speed of 72 m s -1. It is at a height of 102 m above the ground. When the plane is flying over an origin O, a parcel B is released . After some time, parcel B strikes a truck T of height 2.0 m, which is moving along a level road with a constant speed v. At the instant parcel B is released, the truck T is at a distance xo = 125 m from origin O. (a) Calculate the time of flight of parcel B before it strikes truck T. [3] parcel B plane 102 m 2.0 m

3 (b) On the same axes, sketch two graphs to show the variation with time t of the horizontal displacement x from the origin for parcel B and truck T. Label the graphs B and T respectively. Time t = 0 is the instant when parcel B is released from the plane. [2] (c) Using the graphs in part (b) or otherwise, calculate the speed v of truck T. [2] x / m t / s t = 0

4 2. An amusement park ride consists of a rotating circular platform 8.00 m in diameter. The child and the seat can be considered as a mass of 50 kg suspended at the end of 2.5 0 m light rope. When the system rotates, the rope make an angle θ of 28.0o with the vertical. Air resistance is negligible. (a) In the space below, draw a labelled free-body diagram of child A and seat. The child and seat can be considered as a 50 kg mass. [2] (b) Show that the radius of the circular motion of each child and seat is estimated to be 5.2 m. [2] rope 50 kg mass

5 (c) Calculate the speed of each child and seat. [3] (d) Calculate the tension in each rope. [2]

6 3. The diagram shows a mechanism for firing a ball of mass 25 g vertically into the air. The spring has a force constant of 75 N m −1. The ball is placed on the platform at the top of the spring. Assume both the spring and the platform have negligible mass and air resistance is neglible. (a) The spring is compressed by 0.085 m. Calculate the force exerted by the compressed spring on the ball immediately after the spring is released. [2] (b) Calculate the maximum height gained by the ball. The height is measured from the position of the platform when the spring is compressed by 0.085 m. [2]

7 (c) State and explain the effect of the maximum height if air resistance is not negligible. [2] 4. (a) A small iron ball of mass 24 g is heated in a Bunsen flame for about one minute. The iron ball is then quickly transferred to a 40 g copper calorimeter containing 300 g of water, at an initial temperature of 15.0 C. Following the thermal exchange, the equilibrium temperature of the iron ball, and the water system is 22.0 C. The specific heat capacities of iron, copper and water are respectively 0.451 J g-1 K-1, 0.385 J g-1 K-1 and 4.200 J g-1 K-1. (i) Determine the temperature of the Bunsen flame. [2] (ii) Besides thermal energy losses to the surroundings, state one other experimental error that will affect the value of (a)(i). [1]

8 (b) In a simplified model of energy balance of the Earth: - the surface of the Earth absorbs incoming solar radiation of average global intensity I - the surface emits thermal radiation of average intensity I1 - some of the radiation emitted by the surface is absorbed by the atmosphere and re-emitted towards the surface. The average intensity of the radiation is I2. The following data are given. I = 240 W m-2 ; I2 = 150 W m-2. Determine the average temperature of the surface of the Earth according to this model, assuming that the surface behaves as a blackbody. [2]

9 (c) A fixed quantity of 4.5  10-3 mol of air is compressed at a constant temperature. The graph shows the variation of pressire p with volume V of the air. Calculate the temperature of the gas. [2] 5. A lamp is connected in parallel to a resistor of resistance R. These are connected in series to a resistor of resistance 3.0  and a power supply of e.m.f. 6.0 V and of negligible internal resistance, as shown below.

10 The current in the lamp is 0.30 A and its resistance is 5.0 . (a) Show that the resistance R is 1.25 . [2] (b) The power supply transfers 120 J of energy to the circuit. Determine the energy transferred in the lamp. [3] (c) The lamp in the circuit is removed, and the power supply is replaced with one with an e.m.f. of 6.0 V and an internal resistance of r . The current in the circuit is 1.176 A. Determine the value of r. [2]