0625_s14_qp_33
A paper of Physics, 0625
Questions:
12
Year:
2014
Paper:
3
Variant:
3
Login to start this paper & get access to powerful tools
1
Parachutes are used to slow down a certain racing car. shows the racing car, of total mass 750 kg, slowing down by using parachutes. is the speed-time graph for 20 s after the car reaches full speed. time t / s speed m / s At time t = 6.0 s, the parachutes open. On , mark a point, labelled A, where the car is moving at constant speed, mark a point, labelled B, where the car is decelerating at a uniform rate, mark a point, labelled C, where the car is decelerating at non-uniform rate. Calculate the deceleration of the car at time t = 6.5 s, deceleration = the resultant force acting on the car at this time. resultant force = Explain why there is no resultant force acting on the car at time t = 4.0 s.
1. Motion, forces and energy  →  1.2. Motion
1. Motion, forces and energy  →  1.6. Momentum
Open
2
A student wishes to determine the density of a small, irregularly shaped stone. With the aid of a labelled diagram, describe an experiment to determine the volume of the stone. State the other quantity, apart from the volume, that must be measured in order to determine the density. State the formula that is used to calculate the density. The student now wishes to determine the volume of a small, irregularly shaped piece of wood that floats in water. He notices that a small lead weight tied to the wood makes it sink in water. Describe how the student can adapt the experiment in to determine the volume of the wood. You may draw a diagram.
1. Motion, forces and energy  →  1.4. Density
1. Motion, forces and energy  →  1.1. Physical quantities and measurement techniques
Open
3
A metre rule balances when the 50 cm mark is directly above a pivot. State where in the rule its centre of mass is located. shows an apple and a 0.40 N weight placed on the rule so that the rule remains balanced at the 50 cm mark. 25 cm 45 cm pivot 50 cm mark apple 0.40 N weight (not to scale) The centre of mass of the apple is 25 cm from the pivot and the centre of mass of the weight is 45 cm from the pivot. Calculate the weight of the apple, weight = the mass of the apple. mass = The apple is not moved. The weight is removed from the rule and the pivot is moved to the left until the rule balances as shown in . pivot 50 cm mark apple (not to scale) Explain why the arrangement in balances. The pivot in is closer to the 50 cm mark than to the centre of mass of the apple. Compare the weight of the rule to the weight of the apple.
1. Motion, forces and energy  →  1.5.3. Centre of gravity
1. Motion, forces and energy  →  1.3. Mass and weight
Open
4
A teacher shows a class examples of three states of matter. These are a solid metal block resting on the bench, a liquid in a glass beaker and a gas in a clear balloon in the laboratory. a represents the arrangement of molecules in the solid. solid liquid gas a b c Complete b, to show the arrangement of molecules in the liquid. Complete c, to show the arrangement of molecules in the gas. In the list below, draw a ring around the state of matter that is the easiest to compress. the solid the liquid the gas In terms of its molecules, explain why this state of matter is the easiest to compress.
2. Thermal physics  →  2.1.1. States of matter
2. Thermal physics  →  2.2.1. Thermal expansion of solids, liquids and gases
Open
5
During both boiling and evaporation, liquid water is converted into water vapour. The rate at which the mass of boiling water decreases depends only on the rate at which the water is gaining thermal energy. The specific latent heat of vaporisation of water is 2.3 × 106 J / kg. Thermal energy is supplied to boiling water in a kettle at a rate of 460 W. Calculate the mass of water that is boiled away in 180 s. mass = The rate at which the mass of evaporating water decreases depends on other factors. State two of these factors. 1. 2. State two other ways in which evaporation is different from boiling. 1. 2.
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
Open
6
The liquids in five liquid-in-glass thermometers A, B, C, D and E expand linearly with temperature. All the thermometers have scales marked in °C. accurately represents the scales of these five thermometers. °C °C °C °C °C –50 –10 A B C D E Use information from the scales of the thermometers in to state which thermometer has the greatest range. State and explain which thermometer has the greatest sensitivity. Suggest two design features that would cause a liquid-in-glass thermometer to have a large sensitivity. 1. 2. The distance on thermometer B between the 110 °C mark and the −10 °C mark is 18 cm. Calculate the length of the liquid thread above the −10 °C mark when the temperature recorded by B is 70 °C. length =
2. Thermal physics  →  2.2.3. Melting, boiling and evaporation
2. Thermal physics  →  2.2.1. Thermal expansion of solids, liquids and gases
Open
8
A lamp in a large room is suspended below a horizontal mirror that is fixed to the ceiling. is a scale diagram of the lamp and mirror. lamp reflecting surface of mirror An image of the lamp is formed by the mirror. On , draw two rays from the centre of the lamp that strike the mirror. Use these rays to locate the image. Label the image I. State two characteristics of this image. 1. 2. Suggest an advantage of positioning a mirror above the lamp.
3. Waves  →  3.2.1. Reflection of light
Open
9
represents two identical metal plates, positioned horizontally, one above the other in a vacuum. A negative charge of 0.000 000 042 C (4.2 × 10−8 C) is transferred to the upper plate, leaving the lower plate with a positive charge of the same size. On , draw the pattern of the electric field between the two plates and indicate the direction of the lines of force. A conducting copper wire is used to connect the two plates and this leaves the plates uncharged. Charge flows in the wire for 0.000 000 035 s (3.5 × 10−8 s). Calculate the average current in the wire during this time. current = State, in terms of its atomic structure, why the copper wire is an electrical conductor.
4. Electricity and magnetism  →  4.2.2. Electric current
4. Electricity and magnetism  →  4.2.1. Electric charge
Open
11
A battery charger includes a transformer and a rectifier. represents the transformer, consisting of an iron core with two coils P and Q wound on to the core. coil P, 40 000 turns iron core coil Q, 2000 turns P consists of 40 000 turns and Q consists of 2000 turns. When P is connected to a 230 V a.c. supply, there is an e.m.f. across the terminals of Q. Calculate the size of this e.m.f. e.m.f. = Explain how this e.m.f. is generated. The output of Q is connected to the rectifier circuit. State the name of the circuit component that is used in a rectifier circuit to rectify the a.c. (alternating current), the property of this component that is used to rectify the current.
4. Electricity and magnetism  →  4.5.6. The transformer
Open
12
Overhead power cables supply electrical power to a town that is a considerable distance from the power station. The voltage at which the power is transmitted in the cables is very much greater than the voltage at the power station and the voltage of the mains supply in the town. Explain the advantage of transmitting electrical power at a very high voltage. It is suggested that the resistance of the cables can be changed by doubling their diameter. Explain the effect of this change on the resistance of the cables. Suggest one disadvantage of doubling the diameter of the cables.
4. Electricity and magnetism  →  4.5.6. The transformer
4. Electricity and magnetism  →  4.2.5. Electrical energy and electrical power
Open