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# 1009f_Promo_2006_with_answers - RAFFLES JUNIOR COLLEGE 2006...

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RAFFLES JUNIOR COLLEGE 2006 PROMOTION EXAMINATION Leve l : JC 1 Time: 2 h 30 min Date: 29 th Sep 2006 H2 PHYSICS Section A RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE RAFFLES JUNIOR COLLEGE INSTRUCTIONS TO CANDIDATES There are 3 Sections in this paper. Section A consists of 18 multiple-choice questions. For each question, 4 suggested answers are given . You are to choose the most appropriate one and shade your answers on the OMR form. You are advised not to spend more than 35 minutes on Section A. Section B consists of 6 structured questions. You are to write your answers in the spaces provided. Section C consists of 2 longer structured questions. You are to write your answers in the spaces provided. Attempt ALL questions in Sections A, B and C. Answers to Sections A, B and C are to be handed in separately . There are 8 printed pages in this booklet.

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2 DATA AND FORMULAE Data speed of light in free space, c = 3.00 x 10 8 m s 1 permeability of free space, μ 0 = 4 π x 10 7 H m 1 permittivity of free space, ε 0 = 8.85 x 10 12 F m 1 (1/(36 π )) × 10 9 F m 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, m e = 9.11 x 10 31 kg rest mass of proton, m p = 1.67 x 10 27 kg molar gas constant, R = 8.31 J K 1 mol 1 the Avogadro constant, N A = 6.02 x 10 23 mol 1 the Boltzmann constant, k = 1.38 x 10 23 J K 1 gravitational constant, G = 6.67 x 10 11 N m 2 kg 2 acceleration of free fall, g = 9.81 m s 2 Formulae uniformly accelerated motion, 2 1 2 = + s ut at 2 2 2 = + v u as work done on/by a gas = Δ W p V hydrostatic pressure = p gh ρ gravitational potential = − Gm r φ displacement of particle in s.h.m. 0 sin = x x t ω velocity of particle in s.h.m. 0 cos = v v t ω 2 2 0 = ± x x ω resistors in series R = R 1 + R 2 + . . . . resistors in parallel 1/ R = 1/ R 1 + 1/ R 2 + . . . . electric potential V = Q /4 π ε 0 r alternating current/voltage x = x 0 sin ω t
3 Section A (36 marks) 1 The drag force F exerted on a moving car is given by 2 1 2 D F C Av ρ = where v is the speed of the car, ρ is the density of air and A is the maximum cross- sectional area of the car perpendicular to the direction of travel. What are the base units of the constant D C ? A s B m 6 s 3 C 1/2 1/2 1/2 kg m s D None because D C is dimensionless 2 An object is dropped from a building and the time it takes to fall to the ground is recorded as 4.2 s by an observer, whose human reaction time contributes at most 0.2 s to the entire timing process. Given that the height of the building is (82 ± 1) m, and assuming air

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