A constant force, F, pulls a 50 kg block at a constant speed over a rough horizontalsurface, AB, as shown in the diagram below. The coefficient of kinetic friction (μk)between the block and the surface is 0,4. 3.1 Draw a labelled free-body diagram showing ALL the forces acting on theblock. (4) 3.2 State Newton’s first … Read more
3.1 As availability of water is becoming a major problem in South Africa, morepeople are intending to save water. Therefore some of them areinvestigating how they are billed and if the billing is correctly calculated. Mrs. Treace is one of those people and stays in Cape Town. She studied thewater tariffs for 2013–2014 carefully. Below … Read more
Learners conduct an experiment to investigate the effects of intermolecular forces onboiling points. They use 20 mℓ of each of the following compounds in theirinvestigation: water, sunflower oil, nail polish remover, glycerine and methylated spirits.The results are shown in the table below: 3.1 Define the term boiling point. (2) 3.2 Formulate an investigative question for … Read more
3.1 The boiling point of compounds A to E are given in the table below. 3.1.1 Define the term boiling point. (2) 3.1.2 Calculate the molecular mass of compound D. (1) 3.1.3 In what phase is compound B at 25 °C? (1) 3.1.4 Name the type of intermolecular force present in compound A. (1) 3.1.5 … Read more
Consider the list of six substances with their formulae and boiling points in the tablebelow. 3.1 Explain why ethanol is soluble in water. Refer to the relative strength of theintermolecular forces in ethanol and water. (3) 3.2 Explain why the boiling point of iodine is higher than that of bromine. Refer tothe intermolecular forces present … Read more
A compound bar graph below represents salaries of six employees in R100’s for twocompanies. Use the graph to answer the questions below. 3.1 Moesha claims that the mean salary of Company A, is R1 000 more than the meansalary of Company B. Verify, with calculations, whether her statement is valid or not. (6) 3.2 What … Read more
Learners investigate the relationship between net force and acceleration by pulling a trolley across a surface which is slightly inclined to compensate for friction. The trolley is connected to different masses by a string of negligible mass. The string passes over a frictionless pulley. Refer to the diagram below. Ticker-tape attached to the trolley passes … Read more
3.1 Given the finite linear pattern: 12 ; 17 ; 22 ; … ; 172 3.1.1 Determine a formula for the 𝑛th term of the pattern. (2) 3.1.2 Calculator the value of 𝑇12 . (2) 3.1.3 Determine the number of terms in the pattern. (2) 3.2 Given the first four terms of a linear pattern: … Read more
3.1 Study the pie charts below and answer the questions that follow. FIGURE 1: PERCENT DISTRIBUTION OF FIVE LEADING CAUSES OF DEATH, BY AGE GROUP: UNITED STATES, PRELIMINARY 2011 3.1.1 Determine the total number of people aged 25–44 dying from accidents. (2) 3.1.2 Identify the causes of death amongst 1–24 year-old people that are less … Read more
3.1 Study the map below of Fraser River Area from Haney to the Mouth and answer the questions that follow: 3.1.1 Determine the number of sediment monitoring stations from the map. (2) 3.1.2 Write down the type of monitoring station named Marion (Jacobs) Lake. (2) 3.1.3 Identify the sediment monitoring station that lies between Main … Read more