IJC_H1_PHY_P2_SOLUTIONS

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2 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use Data speed of light in free space, c = 3.00 x 108 m s-1 elementary charge, e = 1.60 x 10-19 C the Planck constant, h = 6.63 x 10-34 J s unified atomic mass constant, u = 1.66 x 10-27 kg rest mass of electron, me = 9.11 x 10-31 kg rest mass of proton, mp = 1.67 x 10-27 kg acceleration of free fall, g = 9.81 m s-2 Formulae uniformly accelerated motion, s= u t + ½ a t2 v2 = u2+ 2as work done on/by a gas, W = pV hydrostatic pressure, p = gh resistors in series, R= R 1 + R2 + … resistors in parallel, 1/R = 1/R 1 + 1/R2 + …

3 © IJC 2011 8866/Prelim2 [Turn over For Examiner’s Use Section A Answer all the questions in this section. 1 (a) Complete Fig. 1.1 to show each quantity and its base units. Quantity Base Unit speed m s -1 density kg m-3 power kg m 2 s-3 voltage kg m2 s-3 A-1 [3] Fig. 1.1 (b) Two parallel strings S 1 and S2 are attached to a disc of diameter 12 cm, as shown in Fig. 1.2. Fig. 1.2 The disc is free to rotate about an axis normal to its plane. The axis passes through the centre C of the disc. A lever of length 30 cm is attached to the disc. When a force F is applied at right angles to the lever at its end, equal forces are produced in S 1 and S 2. The disc remains in equilibrium. (i) On Fig. 1.2, show the direction of the force in each string that acts on