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 thereare morepositive charges than negative charges, the rod becomespositivelycharged. [1] (ii) The gold leaf will move away/deflect from the brassplateThe electrons will be attracted and move to the topas unlikecharges attract.The brass plate and gold leaf will become positivelycharged. Sincelike charges repel, the gold leaf deflect away [1] [1] [1] b)(i) I = 0.025/ (0.01 x 10 -3 )= 2.5 x 10 -3 A [1][1] (ii) V = 10/ 0.025= 400 V [1] c)(i) Resistance of B will be 4 times of A [1] (ii) Since V remains the same, the current through B willbe ¼ of A [1]