RVHS_H2_Physics_P1_Soln

River Valley High School Pg 1 of 7 JC 2 H2 Physics 9749 Preliminary Examinations 2024 2024 J2 Prelim P1 Q1 D Q6 C Q11 C Q16 B Q21 A Q26 D Q2 B Q7 B Q12 D Q17 A Q22 A Q27 C Q3 D Q8 B Q13 C Q18 A Q23 A Q28 D Q4 B Q9 D Q14 D Q19 B Q24 C Q29 B Q5 C Q10 C Q15 C Q20 A Q25 A Q30 D 1. Ans: D Option A is wrong. 2 2 − −=   = kgF ma N kg m s ms Option B is wrong. 11 −=  f Hz sT Option C is wrong. =  W Fd J N m Option D is correct. 2 12 sin sin   − −−=  =   = F kg m sF BIL B T kg A s IL A m 2. Ans: B distance travelled between 0 to 20 s distance travelled between 5 to 15 s distance travelled between 0 to 10 s distance travelled between 5 to 10 s= area under v-t graph from 0 to 10 s area under v-t graph from 5 to 10 s 1 0.75 13. = = = 3. Ans: D Since the acceleration on the way up will be larger (air resistance and weight acting in the same direction) than the acceleration of the way down (air resistance and weight acting in opposite directions), the time taken on way up will be less. 4. Ans: B 1 1 1 (62)(0.21) 6.512 6.51 43.40.150 impulse kg m s pv m sm − − == = = = 5. Ans: C 2(10)(9.81 ) 4.45910 12acceleration m s −== +

River Valley High School Pg 2 of 7 JC 2 H2 Physics 9749 Preliminary Examinations 2024 By considering the 12 kg block, tension = resultant force Hence, (12)(4.459) 53.5tension N== 6. Ans: C 2 2 2 2 tan(3.8 ) 9.81 0.65158 0.65158 57.8 3.6 3960.65158 centripetal acceleration centripetal acceleration m s v msr rm − − = = =  == 7. Ans: B For satellite in geostationary orbit, period = 24 hours = 86400 s 2 86400  = gravitational force provides for centripetal force 2 2 1 3 1 11 243 7 22 71 (6.67 10 )(5.97 10 ) 4.2227 10 2 86400 2 (4.2227 10 ) 307186400 GMm mrr GMrm v r v r m s      − − =    = = =      = = =  = Alternatively, a shorter method would skip calculating the radius r. 2 2 32 3 3 3 2 3 3 2 3 11 24 13 3 ( )( ) 2(6.67 10 )(5.97 10 ) 3071 24 3600 GMmmr r r GM to both sides r GM v GM v GM m s         −− = =  = = = =   =  

River Valley High School Pg 3 of 7 JC 2 H2 Physics 9749 Preliminary Examinations 2024 8. Ans: B increase in GPE of space probe = GPEfinal − GPEinitial 11 22 77 8 11(6.67 10 )(1.30 10 )(5500) 1.19 10 (1.19 0.24) 10 6.73 10 final initial GMm GMm rr J − =− − − =   −   +  = 9. Ans: D Statement D is not an essential assumption of kinetic theory of gas and can be derived from pressure of a gas 10. Ans: C heat gained by ice in melting + heat gained by 20 g of water (total mass of water) = heat lost by 130 g of water 0.020 × 3.3 × 105 + [0.020 × 4.2 × 103 × (T – 0)] = 0.130 × 4.2 × 103 × (50 – T) 6.6 × 103 + 84 T = 27.3 × 103 – 546 T 630 T = 20700 T = 33 C distractor: T = 38 C (heat gained by melted ice water omitted) 11. Ans: C Resonance occurs when the natural frequen