2021 J2 H2 Physics Prelim P1 MS Sharing

Anglo-Chinese Junior College 2021 H2 Preliminary Exam Paper 1 Guide H2 (9749) Physics JC2 2020 Page 1 of 4 1 D Depth of swimming pool = 2m Pressure at the bottom of the pool = po + gh = 105 + (103)(10)2 = 107 Pa 2 C 3 C  220 72 3.06 s xxs u t t t       2 2 1 2 10 9.81 3.062 46 m yys u t at   4 B 5 B 6 A    resistive thrust 100 20 2 000 N rel F dmv dt      7 D      20.80 0.30 1.10 m s 70 1.10 77 N 77Apparent difference in mass 7.8 kg9.81 a F m a           8 D

Anglo-Chinese Junior College 2021 H2 Preliminary Exam Paper 1 Guide H2 (9749) Physics JC2 2020 Page 2 of 4 9 C When the string just slackens, the tension in the string is zero. The component of the weight acting in the radial direction provides for the centripetal force.               2 B 2 B 2 2 11 B cos cos 22cos cos 1 5 9 81 71 mvmg r vg r v . rg . . 10 D 11 D 12 D At steady state, pressure in both flasks are the same. Applying ideal gas law 9 PQ QQPP PQ QPP Q P Q PP n RTn RT VV TMV M T V    13 A ( 273.15) ( 273.15) pV nRT pV nR t nRpt V    14 D Heat loss by block of higher temp = Heat gained by block of lower temp 15 ( 35) 30 (95 ) 35 190 2 75 ff ff f Q mc T c T c T TT T         15 C   2 21 22E m f x             2 2 2 2 2110.5 2 3.0 0.40 0.72 222 0.72 m f x m f x E     16 A 17 D 18 A Freq / Hz wavelength / m 9.0 cm tube 13.5 cm tube 5500 0.060 1.50 2.25 7330 0.045 2.00 3.00 7940 0.042 2.17 3.25 11000 0.030 3.00 4.50

Anglo-Chinese Junior College 2021 H2 Preliminary Exam Paper 1 Guide H2 (9749) Physics JC2 2020 Page 3 of 4 19 A 20 C initial final gain in kinetic energy loss in electric p otential energy d 3d 44 1 2 1 2 1 2 qV qV qE d qE d qEd Vqd d qV                    The gain in kinetic energy of the positive ion is independent of d. 21 C x n A 400 200 12.5 B 400 500 5.0 C 650 200 7.7 D 650 500 3.1  / nm

Anglo-Chinese Junior College 2021 H2 Preliminary Exam Paper 1 Guide H2 (9749) Physics JC2 2020 Page 4 of 4 22 A 2 2 2 1 I nevA Iv neA I d