0625_s06_qp_3
A paper of Physics, 0625
Questions:
11
Year:
2006
Paper:
3
Variant:
0
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1
For Examiner’s Use A bus travels from one bus stop to the next. The journey has three distinct parts. Stated in order they are uniform acceleration from rest for 8.0 s, uniform speed for 12 s, non-uniform deceleration for 5.0 s. shows only the deceleration of the bus. speed m/s time/s On , complete the graph to show the first two parts of the journey. Calculate the acceleration of the bus 4.0 s after leaving the first bus stop. acceleration = Use the graph to estimate the distance the bus travels between 20 s and 25 s. estimated distance = On leaving the second bus stop, the uniform acceleration of the bus is 1.2 m / s2. The mass of the bus and passengers is 4000 kg. Calculate the accelerating force that acts on the bus. force = The acceleration of the bus from the second bus stop is less than that from the first bus stop. Suggest two reasons for this. 1. 2.
1. Motion, forces and energy  →  1.2. Motion
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2
For Examiner’s Use A student sets up the apparatus shown in in order to find the resultant of the two tensions T1 and T2 acting at P. When the tensions T1, T2 and T3 are balanced, the angles between T1 and the vertical and T2 and the vertical are as marked on . vertical board pulley pulley 69° 44° P T1 = 6.0 N T2 = 8.0 N T3 In the space below, draw a scale diagram of the forces T1 and T2. Use the diagram to find the resultant of the two forces. State the scale used, scale = the value of the resultant, value = the direction of the resultant. direction =
1. Motion, forces and energy  →  1.5.1. Effects of forces
1. Motion, forces and energy  →  1.1. Physical quantities and measurement techniques
1. Motion, forces and energy  →  1.6. Momentum
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3
For Examiner’s Use An electric pump is used to raise water from a well, as shown in . pump ground well The pump does work in raising the water. State an equation that could be used to calculate the work done in raising the water. The water is raised through a vertical distance of 8.0 m. The weight of water raised in 5.0 s is 100 N. Calculate the work done in raising the water in this time. work done = Calculate the power the pump uses to raise the water. power = The energy transferred by the pump to the water is greater than your answer to . Suggest what the additional energy is used for.
1. Motion, forces and energy  →  1.7.2. Work
1. Motion, forces and energy  →  1.7.4. Power
1. Motion, forces and energy  →  1.7.3. Energy resources
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4
For Examiner’s Use State two differences between evaporation of water and boiling of water. 1. 2. The specific latent heat of vaporisation of water is 2260 kJ / kg. Explain why this energy is needed to boil water and why the temperature of the water does not change during the boiling. A laboratory determination of the specific latent heat of vaporisation of water uses a 120 W heater to keep water boiling at its boiling point. Water is turned into steam at the rate of 0.050 g / s. Calculate the value of the specific latent heat of vaporisation obtained from this experiment. Show your working. specific latent heat of vaporisation =
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
2. Thermal physics  →  2.2.2. Specific heat capacity
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5
For Examiner’s Use shows a tank used for evaporating salt solution to produce crystals. salt solution evaporating tank steam out steam in Suggest two ways of increasing the rate of evaporation of the water from the solution. Changes may be made to the apparatus, but the rate of steam supply must stay constant. You may assume the temperature of the salt solution remains constant. 1. 2. A manufacturer of liquid-in-glass thermometers changes the design in order to meet new requirements. Describe the changes that could be made to give the thermometer a greater range, make the thermometer more sensitive. A toilet flush is operated by the compression of air. The air inside the flush has a pressure of 1.0 × 105 Pa and a volume of 150 cm3. When the flush is operated the volume is reduced to 50 cm3. The temperature of the air remains constant during this process. Calculate the new pressure of the air inside the flush. pressure =
2. Thermal physics  →  2.1.3. Gases and the absolute scale of temperature
1. Motion, forces and energy  →  1.8. Pressure
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6
For Examiner’s Use shows white light incident at P on a glass prism. Only the refracted red ray PQ is shown in the prism. P Q white light red ray screen On , draw rays to complete the path of the red ray and the whole path of the violet ray up to the point where they hit the screen. Label the violet ray. The angle of incidence of the white light is increased to 40°. The refractive index of the glass for the red light is 1.52. Calculate the angle of refraction at P for the red light. angle of refraction = State the approximate speed of the white light incident at P, speed = the red light after it leaves the prism at Q. speed =
3. Waves  →  3.2.2. Refraction of light
3. Waves  →  3.2.4. Dispersion of light
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7
For Examiner’s Use shows how the air pressure at one instant varies with distance along the path of a continuous sound wave. air pressure normal air pressure P X Y distance in direction of travel of the wave What type of waves are sound waves? On , mark on the axis PY one point C where there is a compression in the wave, one point R where there is a rarefaction in the wave. Describe the motion of a group of air particles situated on the path of the wave shown in . The sound wave shown has speed of 340 m / s and a frequency of 200 Hz. Calculate the distance represented by PX on . distance =
3. Waves  →  3.4. Sound
3. Waves  →  3.1. General properties of waves
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8
For Examiner’s Use shows an electrical circuit. 12.0 V d.c. 4.0 Ω R A C B sliding contact one metre resistance wire The resistance of the lamp is 4.0 Ω when it is at its normal brightness. The lamp is rated at 6.0 V, 9.0 W. Calculate the current in the lamp when it is at its normal brightness. current = The sliding contact C is moved to A. The lamp lights at its normal brightness. Calculate the total circuit resistance, resistance = the potential difference across the 4.0 Ω resistor R. potential difference = The sliding contact C is moved from A to B. Describe any change that occurs in the brightness of the lamp. Explain your answer to . The 1 m wire between A and B, as shown in , has a resistance of 2.0 Ω. Calculate the resistance between A and B when the 1 m length is replaced by a 2 m length of the same wire, resistance = the 1 m length is replaced by a 1 m length of a wire of the same material but of only half the cross-sectional area. resistance =
4. Electricity and magnetism  →  4.2.4. Resistance
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9
For Examiner’s Use A transformer is needed to step down a 240 V a.c. supply to a 12 V a.c. output. In the space below, draw a labelled diagram of a suitable transformer. Explain why the transformer only works on a.c., how the input voltage is changed to an output voltage. The output current is 1.5 A. Calculate the power output, power = the energy output in 30 s. energy =
4. Electricity and magnetism  →  4.5.6. The transformer
1. Motion, forces and energy  →  1.7.3. Energy resources
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10
For Examiner’s Use 10 shows a positively charged plastic rod, a metal plate resting on an insulator, and a lead connected to earth. metal plate insulator positively charged plastic rod lead connected to earth Describe how the metal plate may be charged by induction. An electrostatic generator sets up a current of 20 mA in a circuit. Calculate the charge flowing through the circuit in 15 s, charge = the potential difference across a 10 kΩ resistor in the circuit. potential difference =
4. Electricity and magnetism  →  4.2.1. Electric charge
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11
For Examiner’s Use 11 shows a beam of radiation that contains α-particles, β-particles and γ-rays. The beam enters a very strong magnetic field shown in symbol form by N and S poles. beam of radiation N S Complete the table below. radiation direction of deflection, if any charge carried by radiation, if any α-particles β-particles γ-rays
5. Nuclear physics  →  5.2.2. The three types of nuclear emission
4. Electricity and magnetism  →  4.5.4. Force on a current-carrying conductor
5. Nuclear physics  →  5.2.3. Radioactive decay
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