(Start on a new page.) 7.1 In an experiment to verify the relationship between the electrostatic force, FE, and distance, r, between two identical, positively charged spheres, the graph below was obtained. 7.1.1 State Coulomb’s law in words. (2) 7.1.2 Write down the dependent variable of the experiment. (1) 7.1.3 What relationship between the electrostatic … Read more
(Start on a new page.) 6.1 An ambulance is moving towards a stationary listener at a constant speed of 30 m∙s-1. The siren of the ambulance emits sound waves having a wavelength of 0,28 m. Take the speed of sound in air as 340 m∙s-1. 6.1.1 State the Doppler effect in words. (2) 6.1.2 Calculate … Read more
(Start on a new page.) A pendulum with a bob of mass 5 kg is held stationary at a height h metres above the ground. When released, it collides with a block of mass 2 kg which is stationary at point A. The bob swings past A and comes to rest momentarily at a position … Read more
(Start on a new page.) The graph below shows how the momentum of car A changes with time just before and just after a head-on collision with car B. Car A has a mass of 1 500 kg, while the mass of car B is 900 kg.Car B was travelling at a constant velocity of … Read more
(Start on a new page.) A ball is dropped from the top of a building 20 m high. Ignore the effects of air resistance. 3.1 Define the term free fall. (2) 3.2 Calculate the: 3.2.1 Speed at which the ball hits the ground (4) 3.2.2 Time it takes the ball to reach the ground (3) … Read more
(Start on a new page.) A learner constructs a push toy using two blocks with masses 1,5 kg and 3 kg respectively. The blocks are connected by a massless, inextensible cord. The learner then applies a force of 25 N at an angle of 30o to the 1,5 kg block by means of a light … Read more
MULTIPLE-CHOICE QUESTIONS Various options are provided as possible answers to the following questions. Write down the question number (1.1–1.10), choose the answer and make a cross (X) over the letter (A–D) of your choice in the ANSWER BOOK. EXAMPLE: 1.1 The tendency of an object to remain at rest or to continue in its uniform … Read more
10.1 The equations below represent two industrial processes involved in the preparation of ammonium nitrate. Write down the:10.1.1 NAME of substance A (1)10.1.2 FORMULA of substance B (1)10.1.3 NAME given for reaction I (1)10.1.4 NAME or FORMULA of the catalyst used in reaction I (1)10.1.5 Name of process X (1)10.1.6 Name of process Y (1)10.1.7 … Read more
The simplified diagram below represents an electrochemical cell used in the refining of copper. One of the electrodes consists of impure copper. 9.1 What type of power source, AC or DC, is used to drive the reaction in this cell? (1) 9.2 When an electric current passes through the CuCl2(aq), the mass of electrode P … Read more