# FACULTY OF SCIENCE DEPARTMENT OF APPLIED PHYSICS & ENGINEERING MATHEMATICS

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1 FACULTY OF SCIENCE DEPARTMENT OF APPLIED PHYSICS & ENGINEERING MATHEMATICS NATIONAL DIPLOMA IN CHEMICAL ENGINEERING ENGINEERING METALLURY EXTRACTION METALLURGY MODULE CAMPUS PHY1ABT PHYSICS I (Theory) DFC JUNE EXAMINATION DATE: 19 June 2014 ASSESSOR: INTERNAL MODERATOR: SESSION: 12h30 15h30 MR. T.G. MATHE DR. L. REDDY DURATION: 3 HOURS MARKS: 120 NUMBER OF PAGES: 17 PAGES, INCLUDING 2 INFORMATION SHEETS INSTRUCTIONS: SCIENTIFIC CALCULATORS ARE PERMITTED (ONLY ONE PER STUDENT). REQUIREMENTS: ONE EXAMINATION ANSWER SCRIPT PER STUDENT ONE UJ MULTIPLE CHOICE ANSWER SHEET 2/

3 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION QUESTION 2 [15 marks] Start on a new page 2.1 Calculate the resultant (magnitude and direction) of the following displacements using the component method. Draw the relevant vector diagram. 75 m; 40 o N of W 100 m; E 50 o S 50 m; on a bearing of 230 o. (6) 2.2 A ball is thrown upward from the top of a 25 m tall building. The ball s initial speed is 12 m.s -1. At the same instant, a person is running on the ground at a distance of 31 m from the building. What must be the average speed of the person if he is to catch the ball at the bottom of the building? (4) 2.3 A 6.00 kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is Calculate the kinetic frictional force that acts on the box when the elevator is stationary accelerating upward with an acceleration whose magnitude is 1.20 m.s accelerating downward with an acceleration whose magnitude is 1.20 m.s -2. (5) QUESTION 3 [13 marks] Start on a new page 3.1 A dentist s chair with a patient in it weighs 2100 N. The output plunger of a hydraulic system begins to lift the chair when the dentist s foot applies a force of 55 N to the input piston. Neglect any height difference between the plunger and the piston. What is the ratio of the radius of the plunger to the radius of the piston? (4) 3.2 A hot piece of steel of mass 100 g is immersed in 500 g of water at 15 o C contained in a copper calorimeter of mass 200 g. The final steady temperature is observed to be 22.5 o C. Calculate the initial temperature of the steel, assuming that no heat is lost to the surroundings. (5) 4/

4 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION An ideal gas at 15.5 C and a pressure of 1.72 x 10 5 Pa occupies a volume of 2.81 m 3. Take the deal gas constant as 8.31 J.mol -1.K How many moles of gas are present? If the volume is raised to 4.16 m 3 and the temperature raised to 28.2 C, what will be the pressure of the gas? (4) QUESTION 4 [10 marks] Start on a new page 4.1 State (in words) Ohm s Law. (3) 4.2 A battery charger is connected to a dead battery and delivers a current of 6.0 A for 5.0 hours, keeping the voltage across the battery terminals at 12 V in the process. How much energy is delivered to the battery? (3) 4.3 An electrical heater is rated 750 W. Calculate the heat developed in one minute (2) the current it draws from a 220 V supply (2) 5/

5 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION SECTION B MULTIPLE CHOICE QUESTIONS [70 marks] 1. In the figure, Desiree is using a device known as a periscope to observe an object, represented by an upright arrow. The periscope contains two plane mirrors tilted at an angle of 45 relative to Desiree s line of sight. Which one of the following pairs of 45 characteristics of the final image is correct relative to those of the object? 45 A inverted and real B inverted and same size C upright and enlarged D upright and virtual E inverted and diminished 2. Two plane mirrors are connected perpendicular to each other, as shown in the figure. If a person looks into the corner at the image straight ahead of him and closes his left eye as shown, which one of the following statements is true? A The left eye of the image is closed. B The right eye of the image is closed. C Both eyes of the image are open. D Both eyes of the image are closed. E There is no image straight ahead of him, so this question is meaningless. Only the left eye is closed. 3. Which one of the following statements concerning a convex mirror is true? A A convex mirror can form a real image. B A convex mirror must be spherical in shape. C The image produced by a convex mirror will always be inverted relative to the object. D A convex mirror produces a larger image than a plane mirror does for the same object distance. E The image a convex mirror produces is closer to the mirror than it would be in a plane mirror for the same object distance. 6/

6 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION Which one of the following statements concerning the image formed by a concave spherical mirror is true? A When the object distance is less than the focal length, the image is virtual. B When the object distance is larger than the focal length, the image is virtual. C When the object is at the centre of curvature, the image is formed at infinity. D When the object distance is less than the focal length, the image is inverted relative to the object. E When the object distance is larger than the focal length, the image is upright relative to the object. 5. Which one of the following statements concerning the index of refraction for a given material is true? A The index of refraction may be less than 1. B The index of refraction may be measured in nanometres. C The index of refraction does not depend on the frequency of the incident light. D For a given frequency, the index of refraction is inversely proportional to the wavelength of light in vacuum. E For a given frequency, the index of refraction is inversely proportional to the wavelength of light in the material. 6. A ray of green light travels through air and is refracted as it enters a glass prism shown in the figure. An unknown liquid is in contact with the right side of the prism. The light then follows the path shown. Which one of the following statements concerning this situation is true? air glass unknown liquid A The frequency of the light changes inside the prism. B The index of refraction of the glass is smaller than that of air. C The index of refraction of the unknown liquid is the same as that of the glass. D The speed of light is larger in the liquid than in the glass. E The refractive index of the liquid is the same as that of air. 7/

7 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION Questions 7 through 9 refer to the situation described below: A beam of light that consists of a mixture of red, green and violet light strikes a prism (surrounded by air) as shown. Indices of refraction for this prism for the various colours are indicated in the table. An observer is located to the right of the prism as shown. colour red green violet n Incident beam Which colour(s) could, in principle, be seen by the observer? A only red light B only violet light C only green and violet light D only green light E only green and red light 8. Which physical phenomenon is illustrated by the fact that the observer will not see all three colours of light? A refraction B diffraction C interference D dispersion E total internal reflection 9. Which physical phenomenon is illustrated by the fact that the emerging rays are spread into the component colours of the beam? A refraction B diffraction C interference D dispersion E total internal reflection 8/

8 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION Which one of the following statements is true concerning the focal length of a lens? A The focal length is the same for all colours. B The focal length is different for different colours because of reflection. C The focal length is different for different colours because of dispersion. D The focal length is different for different colours because of refraction. E The focal length is different for different colours because of spherical aberration. 11. Water waves approach a slit. The resulting patterns are shown for two different cases, A and B, in which the wavelength and slit size are varied. A B Which one of the following statements concerning these cases is true? A Neither figure shows diffraction. In both cases, the wavelength is much smaller than the slit. B Diffraction occurs in A, but not in B because the wavelength in A is much smaller than the slit. C Diffraction occurs in B, but not in A because the wavelength in B is much smaller than the slit. D Both figures show diffraction. In both cases, the wavelengths are approximately the same size as the slit. E Diffraction occurs in B, but not in A because the wavelength in B is approximately the same size as the slit. 12. Two vectors and are added together to form a vector. The relationship between the magnitudes of the vectors is given by: = 2. Which statement concerning these vectors is true? A. and must be at right angles to each other. B. and could have any orientation relative to each other. C. and must have equal lengths. D. and must be parallel. E. and could be antiparallel. 9/

9 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION A muscle builder holds the ends of a massless rope. At the centre of the rope, a 15 kg ball is hung as shown. What is the tension in the rope if the angle θ in the drawing is 4.5? A 1900 N B 470 N C 150 N D 940 N E 230 N 14. Two forces act on a 4.5 kg block resting on a frictionless surface as shown. What is the magnitude of the horizontal acceleration of the block? A 1.8 m.s -2 B 3.2 m.s -2 C 1.2 m.s -2 D 8.9 m.s -2 E 0.82 m.s N 5.9 N A horse pulls a cart along a flat road. Consider the following four forces that arise in this situation: (1) the force of the horse pulling on the cart (2) the force of the cart pulling on the horse (3) the force of the horse pushing on the road (4) the force of the road pushing on the horse Which two forces form an "action-reaction" pair that obeys Newton's third law? A 1 and 4 B 2 and 4 C 2 and 3 D 1 and 3 E 3 and 4 10/

10 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION Note the following situations: F F M M F M Case 1 Case 2 Case 3 In which case will the magnitude of the normal force on the block be equal to (Mg + F sin θ)? A case 1 only B both cases 1 and 2 C cases 1, 2, and 3 D case 2 only E both cases 2 and Two 5 N boxes are attached to opposite ends of a spring scale and suspended from pulleys (assumed to be frictionless), as shown below. 5 N 5 N What is the reading on the scale? A 0 N B 2.5 N C 5 N D 10 N E 25 N 11/

11 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION A roller coaster starts from rest at the top of an 18 m hill as shown. The car travels to the bottom of the hill and continues up the next hill that is 10.0 m high. 18 m 10.0 m How fast is the car moving at the top of the 10.0 m hill, if friction is ignored? A 6.4 m.s -1 B 13 m.s -1 C 27 m.s -1 D 8.1 m.s -1 E 18 m.s The kinetic energy of a car is 8 x 10 6 J as it travels along a horizontal road. How much power is required to stop the car in 10 s? [Power = work done/time] A zero watts B 8 x 10 4 W C 8 x 10 5 W D 8 x 10 6 W E 8 x 10 7 W 20. The RD of an object is 3. This means that the A density of the object is also equal to 3 B mass to volume ratio of the object is 3 kg.m -3 C ratio density of the object to density of water is equal to 3 D mass of the object is 3 times greater than its volume E None of the above 21. The density of iron is kg.m -3. What is the mass of a solid iron sphere of diameter is 0.50 m? [ ]. A B C D E 123 kg 514 kg kg 164 kg 51.4 kg 12/

12 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION Which one of the following statements concerning a completely enclosed fluid is true? A Any change in the applied pressure of the fluid produces a change in pressure that depends on direction. B The pressure at all points within the fluid is independent of any pressure applied to it. C Any change in applied pressure produces an equal change in pressure at all points within the fluid. D An increase in pressure in one part of the fluid results in an equal decrease in pressure in another part. E The pressure in the fluid is the same at all points within the fluid. 23. The two dams are identical with the exception that the water reservoir behind dam A extends twice the horizontal distance behind it as that of dam B. Which one of the following statements regarding these dams is correct? A The force exerted by the water on dam A is greater than that on dam B. B The force exerted by the water on dam B is greater than that on dam A. C Dam A is more likely to collapse than dam B if the water level rises. D Dam B is more likely to collapse than dam A if the water level rises. E The horizontal distance of the water behind the two dams does not determine the force on them. 24. Which one of the following statements regarding the unique behaviour of water is incorrect? A The density of water increases as the temperature increases from 0 o C to 4 o C. B Water reaches its maximum density at 4 o C. C When water is cooled down from 4 o C to 0 o C it contracts. D At temperatures above 4 o C, the density of water is inversely proportional to the temperature. E The exceptional relationship between the density of water and its temperature is for the survival of marine and plant life during severe winters at the bottom of a frozen lake. 13/

13 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION The unit pascal is defined as A the force acting over a 1 m 2 area B a force of 1 N acting over a 1 m 2 area C the pressure exerted by a 1 N force acting uniformly and perpendicularly over a 1 m 2 area D the pressure being equally and undiminished transmitted throughout a confined fluid should a change in pressure be applied to it E the weight per unit volume 26. Heat can be most accurately described as A a measure of how hot an object is B the absolute temperature of an object C the molecular motion inside an object D the transfer of energy due to a temperature difference E a measure of the kinetic energy of constituent molecules 27. Complete the following statement: Absolute zero means A okay B 0 degrees Celsius C 273 Kelvin D 0 Kelvin E 0 degrees Fahrenheit 28. Three thermometers are in the same water bath. After thermal equilibrium is established, it is found that the Celsius thermometer reads 0 o C, the Fahrenheit thermometer reads 12 o F, and the Kelvin thermometer reads 273 K. Which one of the following statements is the most reasonable conclusion? A The Kelvin thermometer is incorrect B The Celsius thermometer is incorrect C The Fahrenheit thermometer is incorrect D All three thermometers are incorrect E All three thermometers are at different temperatures 14/

14 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION The specific heat capacity of iron is approximately half that of aluminium. Two balls of equal mass, one made of iron and the other of aluminium, both at 80 C, are dropped into a thermally insulated jar that contains an equal mass of water at 20 C. Thermal equilibrium is eventually reached. Which one of the following statements concerning the final temperatures is true? A Both balls will reach the same final temperature. B The iron ball will reach a higher final temperature than the aluminium ball. C The aluminium ball will reach a higher final temperature than the iron ball. D The difference in the final temperatures of the balls depends on the initial mass of the water. E The difference in the final temperatures of the balls depends on the initial temperature of the water 30. Complete the following statement: Bimetallic strips used as adjustable switches in electric appliances consist of two bonded metallic strips that must have different A mass B lengths C volumes D expansion coefficients E specific heat capacities 31. Complete the following statement: When solid NH 3 passes directly to the gaseous state it is said to A melt. B condense. C vaporize. D sublime. E evaporate. 15/

15 PHYSICS 1 (PHY1ABT) JUNE EXAMINATION Which one of the following statements is the best explanation for the fact that metal pipes that carry water often burst during cold winter months? A Water contracts upon freezing while the metal expands at lower temperatures. B The metal contracts to a greater extent than the water. C The interior of the pipe contracts less than the outside of the pipe. D Water expands upon freezing while the metal contracts at lower temperatures. E Both the metal and the water expand, but the water expands to a greater extent. 33. Under which of the following conditions would you expect real gases to approach ideal gas behaviour? A high temperature and high density B low temperature and low pressure C high temperature and low pressure D low temperature and high pressure E high temperature and high pressure 34. The volume of a carbon dioxide bubble rising in a glass of beer is observed to nearly double as the bubble rises from the bottom to the top of the glass. Why does the volume nearly double? A The temperature at the bottom is cooler than it is at the top. B The amount of carbon dioxide in the bubble increases. C The fluid pressure of the beer is greater at the bottom of the glass than at the top. D The pressure inside the bubble decreases as it rises. E The shape of the glass determines the net force exerted on the bubble. 35. Complete the following statement: A bicycle tyre explodes after lying in the hot afternoon sun. This is an illustration of A Charles' law. B Gay Lussac s law. C Pascal s Principle D Boyle's law. E the ideal gas law. END OF EXAMINATION TOTAL MARKS = % = /

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