NATIONAL SENIOR CERTIFICATE GRADE 12
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1 NTIONL SENIOR ERTIFITE GRE 1 HYSIL SIENES: HYSIS (1) FERURY/MRH 016 MRKS: 150 TIME: 3 hours This question paper consists of 14 pages and 3 data sheets.
2 hysical Sciences/1 E/Feb. Mar. 016 INSTRUTIONS N INFORMTION Write your centre number and examination number in the appropriate space in the NSWER OOK. This question paper consists of 11 questions. nswer LL the questions in the NSWER OOK. Start EH question on a NEW page in the NSWER OOK. Number the answers correctly according to the numbering system used in this question paper. Leave ONE line between two subquestions, for example between QUESTION.1 and QUESTION.. You may use a non-programmable calculator. You may use appropriate mathematical instruments. You are advised to use the attached T SHEETS. Show LL formulae and substitutions in LL calculations. Round off your final numerical answers to a minimum of TWO decimal places. Give brief motivations, discussions et cetera where required. Write neatly and legibly.
3 hysical Sciences/1 3 E/Feb. Mar. 016 QUESTION 1: MULTILE-HOIE QUESTIONS Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. hoose the answer and write only the letter ( ) next to the question number ( ) in the NSWER OOK, for example 1.11 E. 1.1 net force F which acts on a body of mass m causes an acceleration a. If the same net force F is applied to a body of mass m, the acceleration of the body will be ¼a ½a a 4a () 1. Two objects of masses m and m are arranged as shown in the diagram below. m d m Which ONE of the changes below will produce the GRETEST increase in the gravitational force exerted by the one mass on the other? ouble the larger mass. Halve the smaller mass. ouble the distance between the masses. Halve the distance between the masses. ()
4 hysical Sciences/1 4 E/Feb. Mar The statements below describe the motion of objects. (i) (ii) (iii) feather falls from a certain height inside a vacuum tube. box slides along a smooth horizontal surface at constant speed. steel ball falls through the air in the absence of air friction. Which of the following describes UNIFORMLY ELERTE motion ORRETLY? (i) and (ii) only (i) and (iii) only (ii) and (iii) only (i), (ii) and (iii) () 1.4 irbags in modern cars provide more safety during an accident. The statements below are made by a learner to explain how airbags can ensure better safety in a collision. (i) (ii) (iii) The time of impact increases. The impact force decreases. The impulse increases. Which of the statements above are ORRET? (i) only (ii) only (ii) and (iii) only (i) and (ii) only () 1.5 The work done by a constant force F applied to an object to increase the object's speed from v to v is W. The work done by the same force to increase the speed of the object from 0 to v will be... ⅓W ½W W 3W ()
5 hysical Sciences/1 5 E/Feb. Mar Light reaching the Earth from a galaxy moving away is shifted towards greater velocities. higher frequencies. longer wavelengths. shorter wavelengths. () 1.7, Q and R are three charged spheres. When and Q are brought near each other, they experience an attractive force. When Q and R are brought near each other, they experience a repulsive force. Which ONE of the following is TRUE? and R have charges with the same sign. and R have charges with opposite signs., Q and R have charges with the same sign., Q and R have equal charges. () 1.8 The minimum value of the resistance that can be obtained by connecting two 4 Ω resistors is... 1 Ω. Ω. 3 Ω. 8 Ω. ()
6 hysical Sciences/1 6 E/Feb. Mar Graph represents the output emf of an generator. Graph Q is the output emf after a change has been made using the SME generator. Output emf (V) V V Q t(s) Which ONE of the following changes has been made to the generator to produce graph Q? The number of turns of the coil has been doubled. The surface area of the coil has been doubled. The speed of rotation has been doubled. The strength of the magnetic field has been doubled. () 1.10 The possible atomic transitions in an excited atom of an element are shown below. LEVEL 4 LEVEL 3 Energy Q LEVEL R S LEVEL 1: ground state Which transition will produce the spectral line with the longest wavelength? Q R S () [0]
7 hysical Sciences/1 7 E/Feb. Mar. 016 QUESTION (Start on a new page.).1 5 kg mass and a 0 kg mass are connected by a light inextensible string which passes over a light frictionless pulley. Initially, the 5 kg mass is held stationary on a horizontal surface, while the 0 kg mass hangs vertically downwards, 6 m above the ground, as shown in the diagram below. The diagram is not drawn to scale. 5 kg 0 kg 6 m When the stationary 5 kg mass is released, the two masses begin to move. The coefficient of kinetic friction, μ k, between the 5 kg mass and the horizontal surface is 0,4. Ignore the effects of air friction..1.1 alculate the acceleration of the 0 kg mass. (5).1. alculate the speed of the 0 kg mass as it strikes the ground. (4).1.3 t what minimum distance from the pulley should the 5 kg mass be placed initially, so that the 0 kg mass just strikes the ground? (1)
8 hysical Sciences/1 8 E/Feb. Mar person of mass 60 kg climbs to the top of a mountain which is m above ground level m Ground level..1 State Newton's Law of Universal Gravitation in words. ().. alculate the difference in the weight of the climber at the top of the mountain and at ground level. (6) [18] QUESTION 3 (Start on a new page.) man throws ball downwards with a speed of m s -1 from the edge of a window, 45 m above a dam of water. One second later he throws a second ball, ball, downwards and observes that both balls strike the surface of the water in the dam at the same time. Ignore air friction. 3.1 alculate the: Speed with which ball hits the surface of the water (3) 3.1. Time it takes for ball to hit the surface of the water (3) Initial velocity of ball (5) 3. On the same set of axes, sketch a velocity versus time graph for the motion of balls and. learly indicate the following on your graph: Initial velocities of both balls and The time of release of ball The time taken by both balls to hit the surface of the water (5) [16]
9 hysical Sciences/1 9 E/Feb. Mar. 016 QUESTION 4 (Start on a new page.) The diagram below shows two trolleys, and Q, held together by means of a compressed spring on a flat, frictionless horizontal track. The masses of and Q are 400 g and 600 g respectively. Q 400 g 600 g When the trolleys are released, it takes 0,3 s for the spring to unwind to its natural length. Trolley Q then moves to the right at 4 m s State the principle of conservation of linear momentum in words. () 4. alculate the: 4..1 Velocity of trolley after the trolleys are released (4) 4.. Magnitude of the average force exerted by the spring on trolley Q (4) 4.3 Is this an elastic collision? Only answer YES or NO. (1) [11]
10 hysical Sciences/1 10 E/Feb. Mar. 016 QUESTION 5 (Start on a new page.) constant force F, applied at an angle of 0 o above the horizontal, pulls a 00 kg block, over a distance of 3 m, on a rough, horizontal floor as shown in the diagram below. F FTER EFORE F 0 o 0 o 00 kg 00 kg 3 m Rough floor The coefficient of kinetic friction, μ k, between the floor surface and the block is 0,. 5.1 Give a reason why the coefficient of kinetic friction has no units. (1) 5. State the work-energy theorem in words. () 5.3 raw a free-body diagram indicating LL the forces acting on the block while it is being pulled. (4) 5.4 Show that the work done by the kinetic frictional force (W fk ) on the block can be written as W fk = ( ,05 F) J. (4) 5.5 alculate the magnitude of the force F that has to be applied so that the net work done by all forces on the block is zero. (4) [15] QUESTION 6 (Start on a new page.) Reflection of sound waves enables bats to hunt for moths. The sound wave produced by a bat has a frequency of khz and a wavelength of 1,5 x 10-3 m. 6.1 alculate the speed of this sound wave through the air. (3) 6. stationary bat sends out a sound signal and receives the same signal reflected from a moving moth at a frequency of 30,3 khz Is the moth moving TOWRS or WY FROM the bat? (1) 6.. alculate the magnitude of the velocity of the moth, assuming that the velocity is constant. (6) [10]
11 hysical Sciences/1 11 E/Feb. Mar. 016 QUESTION 7 (Start on a new page.) Two identical spherical balls, and Q, each of mass 100 g, are suspended at the same point from a ceiling by means of identical light, inextensible insulating strings. Each ball carries a charge of +50 n. The balls come to rest in the positions shown in the diagram below. eiling 0 o 0 o Q 7.1 In the diagram, the angles between each string and the vertical are the same. Give a reason why the angles are the same. (1) 7. State oulomb's law in words. () 7.3 The free-body diagram, not drawn to scale, of the forces acting on ball is shown below. T F e alculate the: w/f g Magnitude of the tension (T) in the string (3) 7.3. istance between balls and Q (5) [11]
12 hysical Sciences/1 1 E/Feb. Mar. 016 QUESTION 8 (Start on a new page.) sphere Q 1, with a charge of -,5 μ, is placed 1 m away from a second sphere Q, with a charge +6 μ. The spheres lie along a straight line, as shown in the diagram below. oint is located a distance of 0,3 m to the left of sphere Q 1, while point X is located between Q 1 and Q. The diagram is not drawn to scale. -,5 μ Q 1 X 0,3 m 1 m +6 μ Q 8.1 Show, with the aid of a VETOR IGRM, why the net electric field at point X cannot be zero. (4) 8. alculate the net electric field at point, due to the two charged spheres Q 1 and Q. (6) [10] QUESTION 9 (Start on a new page.) battery of an unknown emf and an internal resistance of 0,5 Ω is connected to three resistors, a high-resistance voltmeter and an ammeter of negligible resistance, as shown below. V Ω ε 0,5 Ω The reading on the ammeter is 0,. 9.1 alculate the: 4 Ω 8 Ω Reading on the voltmeter (3) 9.1. Total current supplied by the battery (4) Emf of the battery (5) 9. How would the voltmeter reading change if the Ω resistor is removed from the circuit? Write down INRESE, ERESE or REMIN THE SME. Explain the answer. (3) [15]
13 hysical Sciences/1 13 E/Feb. Mar. 016 QUESTION 10 (Start on a new page.) 10.1 simplified sketch of an generator is shown below. ole piece of magnet Q oil To external circuit The coil of the generator rotates clockwise between the pole pieces of two magnets. t a particular instant, the current in the segment Q has the direction shown above Identify the magnetic pole. Only write NORTH OLE or SOUTH OLE. (1) The coil is rotated through 180 o. Will the direction of the current in segment Q be from to Q or Q to? (1) 10. n electrical device is connected to a generator which produces an rms potential difference of 0 V. The maximum current passing through the device is 8. alculate the: Resistance of the device (5) 10.. Energy the device consumes in two hours (5) [1]
14 hysical Sciences/1 14 E/Feb. Mar. 016 QUESTION 11 (Start on a new page.) n investigation was conducted to determine the effects of changes in frequency N intensity on the current generated in a photoelectric cell when light is incident on it. The apparatus used in the investigation is shown in the simplified diagram below. Incident light µ The results of the experiment are shown in the table below. EXERIMENT FREQUENY (Hz) INTENSITY (d) URRENT (µ) 4,00 x ,50 x ,00 x ,01 x E 5,01 x F 6,50 x efine the term work function. () 11. Identify an independent variable. (1) The threshold frequency for the metal used in the photocell is 5,001 x Hz efine the term threshold frequency. () 11.4 alculate the maximum speed of an emitted electron in experiment F. (5) In experiments and E, the current doubled when the intensity was doubled at the same frequency What conclusion can be made from this observation? () [1] TOTL: 150
15 hysical Sciences/1 E/Feb. Mar. 016 T FOR HYSIL SIENES GRE 1 ER 1 (HYSIS) GEGEWENS VIR FISIESE WETENSKE GR 1 VRESTEL 1 (FISIK) TLE 1: HYSIL ONSTNTS/TEL 1: FISIESE KONSTNTES NME/NM SYMOL/SIMOOL VLUE/WRE cceleration due to gravity Swaartekragversnelling g 9,8 m s - Universal gravitational constant Universele gravitasiekonstant G 6,67 x N m kg Radius of the Earth Radius van die arde R E 6,38 x 10 6 m Mass of the Earth Massa van die arde M E 5,98 x 10 4 kg Speed of light in a vacuum Spoed van lig in 'n vakuum c 3,0 x 10 8 m s -1 lanck's constant lanck se konstante h 6,63 x J s oulomb's constant oulomb se konstante k 9,0 x N m harge on electron Lading op elektron e -1,6 x Electron mass Elektronmassa m e 9,11 x kg
16 hysical Sciences/1 E/Feb. Mar. 016 TLE : FORMULE/TEL : FORMULES MOTION/EWEGING vf v f x = vi t + 1 a t or/of = vi + a t y = vi t + 1 a t vi + v f vi + v f = v i + a x or/of v f = v i + a y x = t or/of y = t FORE/KRG F net = ma p = mv max fs = μsn Fnet t = p p = mv - f mv i f k = μ N k w = mg m m d m m r 1 1 F =G or/of F =G g= G g= G WORK, ENERGY N OWER/REI, ENERGIE EN RYWING M d or/of M r W = F x cos θ U = mgh or/of E = mgh 1 K = mv or/of W nc E = k 1 mv = K + U or/of Wnc = Ek + Ep W net = K or/of Wnet = Ek K = K f K i or/of Ek = Ekf Eki W = t ave = Fv ave / gemid = Fv gemid WVES, SOUN N LIGHT/GOLWE, KLNK EN LIG v = f λ 1 T = f v ± v L L L = fs fl fb v ± v s v ± v b f v ± v = E = hf or /of E = W o + E k(max) or/of E = W o + Kmax where/waar 1 E = hf and/en W 0 = hf0 and/en E k(max) = mv max or/of E = hc λ 1 K = max mv max
17 hysical Sciences/1 E/Feb. Mar. 016 ELETROSTTIS/ELEKTROSTTIK kq Q 1 F= E = r kq r W V = q F E = q Q n = e or / of n = Q q e ELETRI IRUITS/ELEKTRIESE STROOMNE V R = I Rs = R1 + R = R R R p 1 W = Vq W = VI t W = I R t W = V Δt R emf ( ε ) = I(R + r) emk ( ε ) = I(R + r) q = I t W = t = VI = I R V = R LTERNTING URRENT/WISSELSTROOM Imax I rms = / I = wgk I maks V V = max rms / V V = wgk maks = I / gemiddeld = V wgk Iwgk ave V rms rms = R / = R ave I rms Vrms ave = / R gemiddeld I wgk gemiddeld = V wgk R
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