2022 RI Promo Sect B QP

© Raffles Institution [Turn over Name: ( ) CT Group: 23S0 RAFFLES INSTITUTION 2022 YEAR 5 PROMOTION EXAMINATION 30 September 2022 H2 PHYSICS RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION RAFFLES INSTITUTION I Section B INSTRUCTIONS TO CANDIDATES Write your name, index number and CT Group. Write your answers to Section B in the spaces provided in this booklet. For Examiner’s Use Section A MCQ / 15 Section B 16 / 10 17 / 10 18 / 9 19 / 11 20 / 10 Section C 21 / 15 22 / 15 Deductions Total / 95 There are 13 printed pages, inclusive of the cover page, in this booklet

2 © Raffles Institution 16 A man of mass 50 kg is standing in a lift that starts from rest on the ground floor at t = 0 s and rises to the top floor over a 10 s interval. The acceleration a of the man changes with time t as shown in Fig. 16.1. The value of the acceleration at t = 9.0 s is q. (a) By considering the forces acting on t he man, explain why the magnitude of q cannot exceed g, the acceleration due to free fall of the Earth. [2] (b) The man comes to rest at the top floor. Determine q, the acceleration of the man at t = 9.0 s. q = m s 2 [2] a / m s2 t / s 10 8.0 5.0 2.5 2.0 q 0 Fig. 16.1 9.0

3 © Raffles Institution [Turn over (c) (i) On Fig. 16.2, sketch a graph to show how the velocity v of the man varies with time t. Label the vertical axis with appropriate values. [3] (ii) Using your answer in (c)(i) or otherwise, calculate the distance travelled by the man durin g the first 5.0 seconds. distance travelled = m [1] (iii) Determine the work done by the normal c ontact force on the man during the first 5.0 seconds. work done = J [2] v / m s1 t / s 10 8 4 2 0 Fig. 16.2 6

4 © Raffles Institution 17 At the San Antonio Zoo, it is possible to have a tug of war battle with a lion cub. The lion enclosure is landscaped to mimic a savanna with uneven ground and grass. A light rope is passed through a hole in the glass wall o