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Forces of 3N and 4N act at right angles, as shown.
What is the resultant force?
549
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510
A light ball is held at rest at the top of a tall cliff. It is released and falls through the air, eventually reaching its terminal velocity. Which row describes the behaviour of the ball as it descends? [Table_1]
563
556
577
The graph represents the motion of a car. How far has the car moved between 0 and 5s?
555
548
515
Which statement about mass or weight is not correct?
512
591
586
A sphere P, made of steel, has a weight of 10 N on Earth. Another sphere Q, also made of steel, has a weight of 10 N on Mars. The gravitational field strength on Earth is greater than the gravitational field strength on Mars. Which statement is correct?
529
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554
Which two quantities must be known to determine the density of a material?
583
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551
A truck is towing a car along a straight horizontal road at a constant speed. The rope breaks. Which row gives the direction of the initial acceleration of the truck after the rope breaks and the reason for the acceleration? [Table_1]
538
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509
A uniform beam is pivoted at the centre and two identical masses, X and Y, are placed so that the beam balances. A smaller mass is then added at the position shown. How can the masses be positioned so the beam balances again?
566
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566
A resultant force of 2.0 N acts on an object of mass 3.0 kg for 6.0 s. What is the change in velocity of the object?
525
567
585
The diagram shows the energy stores for a mobile (cell) phone and how the energy is transferred between stores. What describes how the chemical energy is transferred?
559
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569
A wind turbine is 30\% efficient and has an output of 2.5 MW of electrical power.
What is the power input to the turbine?
580
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535
Which two physical quantities must be used to calculate the power developed by a student running up a flight of steps?
504
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571
The density of sea water is 1030 kg/m^3.
The gravitational field strength on the Earth is 9.8 N/kg.
Atmospheric pressure is 101000 Pa.
At which depth in sea water is the total pressure due to the atmosphere and the water equal to 513000 Pa?
580
562
517
Four students describe the phrase 'absolute zero' during a lesson on the particle model. Which student is correct?
566
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543
Four students are asked to state and explain the relative magnitudes of the thermal expansion of solids and gases. Which student is correct?
560
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590
Four cups A, B, C, and D contain hot coffee.
Which cup keeps the coffee warm the longest?
[Table_1]
572
530
599
The diagram shows a wave. What are the amplitude and the wavelength of this wave?
572
562
513
Optical fibres are used to transmit digital signals using infrared radiation. The average refractive index of the fibres is 1.50. Which row describes a digital signal and gives the speed of infrared radiation in the fibres? [Table_1]
584
533
591
Which statement describes monochromatic light?
560
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522
A beam of light consists of yellow and blue light.
The beam of light is incident on a glass prism.
Which diagram is correct?
600
523
549
A radio station broadcasts a signal with a frequency of 89 MHz.
What is the wavelength of this signal?
508
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575
A boy shouts and hears the echo from a tall building 2.2 s later. The speed of sound in air is 330 m/s. How far away from the boy is the building?
542
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526
The magnetic field of a bar magnet can be represented by magnetic field lines. Which diagram shows two magnetic field lines correctly?
535
526
569
A plastic rod is rubbed with a dry cloth. The rod becomes positively charged.
Why has the rod become positively charged?
538
503
578
Which statement about electric current in a conductor is correct?
590
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565
A piece of metal wire X with a uniform diameter has resistance \( R \).
[Image_1: Wire X]
A second piece of wire Y is made of the same metal and has a uniform diameter.
Y has double the cross-sectional area of X and half the length of X.
[Image_2: Wire Y]
What is the resistance of Y?
502
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505
An electric fire is connected to a 240V supply and transfers energy at a rate of 1.0 kW.
How much charge passes through the fire in 1.0 h?
572
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588
Two lamps are connected in parallel. Which switches must be closed so that both lamps light?
526
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503
The diagram shows a circuit that switches on a lamp when there is a change in the environment. Which change in the environment causes the lamp to be switched on?
570
566
588
A step-down transformer is 100\% efficient. It has an input voltage of 240V a.c. and an output voltage of 60V a.c.
The current in the primary coil is 0.50A.
What is the current in the secondary coil?
588
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600
The diagram shows the pattern of the magnetic field due to the current $I$ in a straight wire. Which row is correct? [Table_1]
580
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544
In which device is the magnetic effect of a current not used?
514
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597
Fission and fusion are two types of nuclear process.
How does the total mass of the nuclides produced compare with the total mass of the original nuclide or nuclides in these nuclear processes?
[Table_1]
540
507
517
The table shows the composition of three different nuclei. [Table_1]
Which nuclei are isotopes of the same element?
535
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579
Which change occurs in the nucleus of a radioactive atom during $\beta$-emission?
551
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519
A radioactive isotope has a half-life of 8 days.
A detector close to a sample of this isotope gives a count rate of 200 counts per minute.
Without the source, the background count is 20 counts per minute.
What is the count rate due to the source after 8 days?
544
599
541
Which statement about the Solar System is correct?
502
528
537
Comets are bodies which orbit the Sun in the Solar System.
What is the shape of the orbit and how is the Sun positioned within the orbit?
[Table_1]
548
598
581
Which nuclear reaction produces the release of energy to power a star?
595
559
546
What is the definition of the Hubble constant?
519
534
522
