0625_w10_qp_31
A paper of Physics, 0625
Questions:
11
Year:
2010
Paper:
3
Variant:
1
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1
An object of weight W is suspended by two ropes from a beam, as shown in . 60° W 86.6 N 50.0 N 30° The tensions in the ropes are 50.0 N and 86.6 N, as shown. In the space below, draw a scale diagram to find the resultant of the two tensions. Use a scale of 1.0 cm = 10 N. Clearly label the resultant. From your diagram, find the value of the resultant. resultant = State the direction in which the resultant is acting. State the value of W. W =
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
shows a hydraulic lift in a car repair workshop. hydraulic fluid 4 pistons, each of area 0.02 m2 piston A, area 0.01 m2 car support The hydraulic fluid transmits the pressure, caused by piston A, equally to each of the four pistons holding up the car supports. The pressure throughout the fluid is the same. A force of 1000 N on piston A is just enough to raise the car. Using values from , find the pressure caused by piston A on the fluid, pressure = the total upward force caused by the fluid. force = The weight of each of the two car supports is 1000 N. Calculate the mass of the car. mass =
1. Motion, forces and energy  →  1.8. Pressure
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4
A student in a laboratory uses the apparatus shown in to determine the specific heat capacity of aluminium. to low voltage supply and measuring instruments electrical heater thermometer aluminium block The readings obtained in the experiment are given below. mass of aluminium block = 0.930 kg initial temperature of block = 13.1 °C final temperature of block = 41.3 °C electrical energy supplied = 23 800 J Define specific heat capacity. Use the readings above to calculate the specific heat capacity of aluminium. State the equation you use. specific heat capacity = Because the student knows it is good scientific practice to repeat readings, after a short time he carries out the experiment again, supplying the same quantity of electrical energy. This time the temperature readings are: initial temperature of block = 41.0 °C final temperature of block = 62.1 °C Use these figures to calculate a second value for the specific heat capacity of aluminium. specific heat capacity = The student did not make any mistakes when taking the readings. Suggest why the second value for the specific heat capacity of the aluminium is greater than the first. Suggest two ways of improving the experiment in order to give as accurate a result as possible. 1. 2.
2. Thermal physics  →  2.2.2. Specific heat capacity
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5
shows a model cable-car system. It is driven by an electric motor coupled to a gear system. 2.0 m 6.0 m gears electric motor model cable-car smooth pulley The model cable-car has a mass of 5.0 kg and is lifted from the bottom pulley to the top pulley in 40 s. It stops automatically at the top. Calculate the average speed of the cable-car, average speed = the gravitational potential energy gained by the cable-car, gravitational potential energy gained = the useful output power of the driving mechanism. power = How would the electrical power input to the motor compare with your answer to ?
4. Electricity and magnetism  →  4.2.5. Electrical energy and electrical power
1. Motion, forces and energy  →  1.7.4. Power
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7
The following list contains the names of types of energy transfer by means of waves. γ-rays, infra-red, radio/TV/microwaves, sound, visible light, X-rays Which one of these is not a type of electromagnetic wave? State the nature of the wave you have named in . The remaining names in the list are all regions of the electromagnetic spectrum, but one region is missing. Name the missing region. A television station emits waves with a frequency of 2.5 × 108 Hz. Electromagnetic waves travel at a speed of 3.0 × 108 m / s. Calculate the wavelength of the waves emitted by this television station. State the equation you use. wavelength =
3. Waves  →  3.3. Electromagnetic spectrum
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8
The circuit in contains a 2.0 V cell, whose resistance you should ignore. There are also three resistors, a 3-position switch, an ammeter and another component, P. 20.0 5.0 S A B C P 2.0 V A State the name of component P. Deduce the resistance of the circuit when switch S is in position A, resistance = in position B. resistance = Describe and explain what is seen on the ammeter when S is moved to position C. With S in position A, calculate how long it takes for the circuit to transfer 320 J of electrical energy to other forms. time taken =
4. Electricity and magnetism  →  4.2.4. Resistance
4. Electricity and magnetism  →  4.2.5. Electrical energy and electrical power
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9
In , A and B are two conductors on insulating stands. Both A and B were initially uncharged. A B X Y Conductor A is given the positive charge shown on . On , mark the signs of the charges induced at end X and at end Y of conductor B. Explain how these charges are induced. Explain why the charges at X and at Y are equal in magnitude. B is now connected to earth by a length of wire. Explain what happens, if anything, to the charge at X, the charge at Y.
4. Electricity and magnetism  →  4.2.1. Electric charge
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10
Emissions from a radioactive source pass through a hole in a lead screen and into a magnetic field, as shown in . 3 cm C B magnetic field into paper radioactive source lead screen A Radiation detectors are placed at A, B and C. They give the following readings: A B C 32 counts / min 543 counts / min 396 counts / min The radioactive source is then completely removed, and the readings become: A B C 33 counts / min 30 counts / min 31 counts / min Explain why there are still counts being recorded at A, B and C, even when the radioactive source has been removed, and give the reason for them being slightly different. From the data given, deduce the type of emission being detected, if any, at A, at B and at C when the radiation source is present. State the reasons for your answers. detector at A detector at B detector at C
5. Nuclear physics  →  5.2.1. Detection of radioactivity
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