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10.1 The apparatus illustrated in the simplified diagram below is used to demonstrate the photoelectric effect. 10.1.1 Define the term photoelectric effect. (2) Incident light of frequency 1,2 x 1015 Hz is shone onto the metal plate and electrons are emitted.Calculate the:10.1.2 Number of photoelectrons emitted in one second if the totalenergy transferred by the … Read more

9.1 The simplified sketch of an electric motor is shown below. 9.1.1 Write down the energy conversion that takes place in this motor. (1) 9.1.2 Is the motor above an AC motor or a DC motor? (1) 9.1.3 What is the function of the commutator in this motor? (1) 9.2 A resistor Y is rated … Read more

In the circuit below a battery of UNKNOWN emf and an internal resistance of 0,5 Ω is connected to two resistors of 4 Ω and 8 Ω each, and a resistor R of unknown resistance.Ignore the resistance of the connecting wires. 8.1 The three external resistors are ohmic conductors.Explain the meaning of the term ohmic … Read more

7.1 Two small, identical spheres, P and T, are placed a distance of 0,1 m apart, B as shown in the diagram below. P carries a charge of +3 x 10-6 C and T carries a charge of -3 x 10-6 C. 7.1.1 State Coulomb’s law in words. (2) 7.1.2 Draw the resultant electric field … Read more

A car moves at a constant speed of 10 m∙s-1 TOWARDS a stationary sound source.The sound source emits sound waves of frequency 880 Hz.A sound detector A is attached to the car and another sound detector B is attached to the sound source. Detector B detects the sound waves reflected from the car. The speed … Read more

Arrestor beds are used to help moving trucks to come to a stop when their brakes fail.The driver of a 30 000 kg truck driving down a steep road drives onto an ASCENDING arrestor bed inclined at 28° to the horizontal, as shown in the diagram below. 5.1 State the work-energy theorem in words. (2) … Read more

4.1 What is meant by an isolated system in physics? (2) During an experiment, a rocket of unknown mass is mounted on a toy cart of mass 20 kg. The cart-rocket combination moves at a constant speed of 2,5 m∙s-1 along a horizontal floor.At a certain instant, the rocket is fired horizontally in the direction … Read more

A small disc, C, is thrown vertically upwards at a speed of 15 m∙s-1 from the edge ofthe roof of a building of height 30 m. AFTER 0,5 s, a small ball B is shot vertically upwards from the foot of the building at a speed of 40 m∙s-1 in order to hit disc C.Ignore … Read more

A man faces difficulty while swimming in a dam. During the rescue operation, an inflated tube attached to a helicopter by a rope is dropped from the helicopter.The man, of mass 70 kg, holds onto the inflated tube of mass 4 kg, while the helicopter is flying horizontally at a CONSTANT speed. An average frictional … Read more