canberra answer sheet

1 2 3 4 5 6 7 8 9 10C C C B B A C B D B11 12 13 14 15 16 17 18 19 20B A B B D A A C C A 1a) From 0 to x, it is moving at constant decelerationfrom x to 2.5, it is moving at constant acceleration [1][1] b) 10 = 10/xx = 1.00 s [1] c) dist = ½ x 1 x 10= 5.00 m [1] ecf[1] d) ½ x 1.5 x 15 – 5= 6.25 m [1] ecf[1] 2a) Draw a correct scaled diagramCorrect resultant force with label and double arrowmagnitude = 1160 kN (1040 – 1280)direction= 15 degree from 600N (14 – 16) [1][1][1][1] b) a = F/m= 1160000/50379000= 0.0230 [1][1] 3a) GPE = 500 x 10 x 30= 150000 J [1] b) KE = ½ x 500 x 2 2 = 1000 J [1] c) ½ (500)v 2 = 151000v = 24.6 m/s [1][1] d) E = 15100 – (500)(10)(25) = 26000F = 26000/150= 173 N [1] [1] 4a As d1 is much smaller than d2, force F will be greaterthan W atequilibrium position. [1] b) W x 35 = 1000 x 2W = 57.1 N [1][1]

5a) The transverse wave move perpendicular to the vibrationof waveparticle while longitudinal wave move parallel tothe vibration ofwave particle. [1] (b) v = 5 x 3= 15 cm/s [1][1] (c) The speed will increase. Since v = f λ , the frequencyis constantwhile the wavelength in the deeper region increase.So the speedincreases. [1][1] 6(a) Magnified, inverted and real (Any two) [1] (b} Correct lens positionCorrect FCorrect ray with arrow [1][1][1] (c) The image become more magnified as it shift towardsthe lens.After the distance is lesser than F, the image becomevirtual,magnified and upright [1] [1] 7(a) The angle of incidence is 0 [1] b) c = sin -1 (1/1.51)= 41.5 [1] c) the angle of incidence is 45 which is greater thanthe critical angle,total internal reflection will occur [1][1] 8a) Liquid molecules have strong forces of attractionand themolecules can slide pass each other. [1] b) The internal kinetic energy remain the same whilethe internal potential energy increase [1][1] c) Air/vapour is not a good conductor of heat [1] 9a) A is negative terminal B is positive terminal [1] b) (1 + ½) -1 + 7 = 7.67 Ω [1m for parallel circuitcalculation][1] c) P = 9 2 /7.67= 10.6 W [1][1]

d) the current will decrease [1] 10a P = 3.3 x 230= 759 W [1] b cost = 0.759 x 4 x 365 x 0.195= $216 [1] ecf[1] c(i) 4 or 5A [1] (ii) On the live wire.So that the air conditioner is disconnected from thelive voltageand prevent electric shock [1][1] (d) Earth wire. or any relevant answerIn case there is a fault, the current will flow throughthe earth wirewhich has low resistance into the earth. [1] [1] (e) correct label and valueof x-axis [1]correct label and valueof y-axis [1] 11a) The wave will propagate through a series of compressionandrarefactionThe wave transfer energy as a longitudinal wave andit will moveparallel to the vibration of wave particles. [1] [1] b) (7.5 – 4.0) x 60= 210 km [1][1] c) Human hearing frequency is 20 to 20kHz. P wave frequencyislower than 20 Hz [1] d) λ = 4/10= 0.4 km [1] e) 1.5 cm 2 = 0.00015 m 2 P = 15/0.00015 [1]

= 100000 Pa [1] f) half amplitudedouble frequency [1][1] 12a)(i) the Perspex rod loses electrons to the cloth. As t