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Cambridge IGCSE™
This document has 16 pages. Blank pages are indicated.
INSTRUCTIONS ● Answer all questions. ● Use a black or dark blue pen. You may use an HB pencil for any diagrams or graphs. ● Write your name, centre number and candidate number in the boxes at the top of the page. ● Write your answer to each question in the space provided. ● Do not use an erasable pen or correction fluid. ● Do not write on any bar codes. ● You may use a calculator. ● You should show all your working and use appropriate units. ● Take the weight of 1.0 kg to be 10 N (acceleration of free fall = 10 m / s2).
INFORMATION ● The total mark for this paper is 80. ● The number of marks for each question or part question is shown in brackets [ ].
(c) A bus is travelling along a straight road. The bus and the driver have a combined mass of 16 000 kg when there are no passengers in it. The bus has 73 passengers. The average mass of each of the passengers is 65 kg.
(i) Calculate the total mass of the bus, the driver and the 73 passengers.
mass = ......................................................... [2]
(ii) The fully loaded bus accelerates uniformly from rest to a speed of 14 m / s. The time taken to reach a speed of 14 m / s is 20 s.
Calculate the resultant force on the bus during the acceleration.
force = ......................................................... [2]
5 (a) Fig. 5.1 shows a plastic cup. The cup contains sand, an electric heater and a thermometer.
thermometer
plasticcup
electricheatersand
Fig. 5.1
The power of the heater is 50 W. The mass of the sand in the cup is 550 g. The initial temperature of the sand is 20 °C. The heater is switched on for 2.0 minutes. The temperature is recorded until the temperature stops increasing. The highest temperature recorded by the thermometer is 33 °C.
(i) Calculate the energy supplied by the heater.
energy = ......................................................... [2]
(ii) Calculate a value for the specific heat capacity of the sand, using your answer to (a)(i) and the data in the question.
specific heat capacity = ......................................................... [3]
(iii) Explain why the specific heat capacity of sand may be different from the value calculated in (a)(ii).
(b) Fig. 8.1 shows a polystyrene ball covered with aluminium paint. The polystyrene ball is suspended between two charged metal plates by an insulated thread.
positivelychargedmetal plate
negatively chargedmetal plate
insulated thread
polystyrene ballcovered withaluminium paint
Fig. 8.1
The ball oscillates between the two charged plates.
9 Fig. 9.1 shows a simple direct current (d.c.) electric motor. The coil rotates about the axis when there is a current in the coil. The coil is connected to the rest of the circuit by the brushes.
+ –
brushbrush
coilaxis
NS
Fig. 9.1
(a) (i) On Fig. 9.1, draw a pair of arrows to show which way the coil rotates. Explain the direction you have chosen.
(ii) Carbon-14 has a half-life of 5700 years. There are atoms of carbon-14 in all living organisms.
An archaeologist digs up some ancient wood. In the same laboratory as in (b)(i), a sample of this ancient wood gives a reading of 20 counts / min. An equivalent sample of living wood gives a reading of 80 counts / min. It is suggested that the age of the ancient sample is 11 400 years.
Do a calculation to check whether this suggestion is correct.
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