Tiêu đề 2018 GCE A level H2 Physics 9749 Ans.pdf ✅

H2 Physics Nov 2018 GCE A-Level Solutions

2018 A level P1 Solution 1. T = 2(L/g)2 g = 2  L/T2 ∆݃ ݃ = ܮ∆ ܮ + 2∆ܶ ܶ 2 = 0.8 +2 (∆் ் ) ∆் ் = 0.6 % Note: Make g the subject as the aim of experiment is to determine g and asking about the uncertainty in T to for g to have an uncertainty of 2%. Ans: A 2. Since the graph for P is shifted down by half (v become v/2 and 0 become -v/2), the position where the graph in Q cuts the x-axis is 1⁄2 t1. Area under graph for P = distance = displacement = 1⁄2 v t1 + 1⁄2 v (t2 – t1) Area under graph for Q (ignoring direction) = distance = 2( 1⁄2 )(v/2) ( 1⁄2 t1) + 2 ( 1⁄2 ) (v/2) 1⁄2 ( t2 - t1) = (v/2) ( 1⁄2 t1) + ( 1⁄2 ) (v/2) ( t2 - t1) Area under graph for Q (including direction) = displacement = 0 Distance and displacement for P and Q are different. Ans: A 1⁄2 t1 t1 + 1⁄2(t2 – t1)  Relatively easy questions: 3,4,13,15,16,19,21,25,28,29 and 30  Relatively challenging questions: 1,2,5,9,11,18,24,26 and 27