The diagram below shows a light ray travelling through an optical fibre. The fibre ismade from two different glass materials known as the core glass and the outercladding glass. These two types of glass materials have different refractive indices. 7.1 State the TWO conditions necessary for total internal reflection to occur. (4) 7.2 Which part … Read more
The table below shows accurate values for the refractive indices (relative to air) ofsome optical media obtained during refraction experiments. The optical densities of themedia increase from water to diamond. 6.1 What important deduction about the relationship between a medium and itsrefractive index can be made from the information above?(2) 6.2 Define the term refraction.(2) … Read more
Gravitational force exists between the sun and the Earth. 5.1 State Newton’s law of Universal Gravitation in words. (2) 5.2 The mass of the sun is 330 000 times greater than that of the Earth. Thedistance between the centres of the sun and the Earth is 1,38 x 109 m.Calculate the gravitational force that the … Read more
4.1 In the diagram below, a 2 kg block is connected to a 1 kg block by means of alight inextensible string. The blocks are pulled up an inclined plane, whichforms an angle of 28o to the horizontal. The sides of the blocks which touchthe inclined plane have the same area. The kinetic frictional force … Read more
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
ANNEXURE A ANNEXURE BQUESTION 2.1.2NAME:GRADE 11: ANNEXURE CQUESTION 4.1.7NAME:GRADE 11:
4.1 The following table illustrates the weather forecast for George fromWednesday, 14 January 2015 to Tuesday, 20 January 2015. Study theweather forecast and answer the questions that follow. 4.1.1 Calculate the mean day temperature for George for the forecastedperiod. Round your final answer to the nearest temperature in °C. (4) 4.1.2 Determine the range for … Read more
Three forces, P, Q and R, of magnitudes 500 N, 200 N and 300 N respectively, act ona point O in the directions shown in the diagram below. The forces are NOT drawn to scale. 2.1 Refer to the information in the diagram above and give a reason why forcesP, Q and R are classified … 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
2.1.1 The total cost for Call package A is given by the following formula:Total cost (in Rand) = R100 + number of minutes more than 100 x R0,80 (a) Write down a formula which can be used to calculate thetotal cost in Rand for Call package B. (3) (b) If Call package B is used, … Read more