NYJC_H1_PHY_P2_QP

NANYANG JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 1 CANDIDATE NAME CLASS TUTOR’S NAME PHYSICS 8866/02 Paper 2 Structured questions 20 September 2011 2 hours Candidates answer on the Question Paper. No Additional Materials are required READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Section B Answer any two questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A 1 2 3 4 5 Section B 6 7 8 Total This document consists of 20 printed pages.

2 NYJC 2011 8866/01/J2PRELIM/11 DATA AND FORMULAE Data speed of light in free space c = 3.00 x 10 8 m s –1 elementary charge e = 1.60 x 10 –19 C the Planck constant h = 6.63 x 10 –34 Js 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 = ut + ½ at2 v2 = u2 + 2as work done on/by a gas W = p∆V hydrostatic pressure p = ρgh resistors in series R = R1 + R2 + .... resistors in parallel 1/R = 1/ R1 + 1/R2 + ....

3 NYJC 2011 8866/01/J2PRELIM/11 [Turn over For Examiner’s Use Section A Answer all the questions in this section. 1 (a) Fig 1.1 shows two blocks, P and Q connected by an inextensible cord over a pulley system. The mass of blocks P and Q are m and 5.0 kg respectively. Block P is suspended freely on one end of the cord, while block Q is placed on ramp with rough surface at an angle of inclination of 25 0. Given that block Q is sliding down the ramp with a constant acceleration of 0.50 m s-2 and the frictional force between the ramp and Q is 7.0 N, determine the mass of block P. mass of block P = ………………… kg [2] (b) The cord was cut when block Q is moving at a speed of 0.10 m s -1 and is 1.2 m away from the bottom of the rough ramp, as shown in Fig 1.2. The frictional force opposing the motion of Q increases with its speed. 5.0 kg rough surface Q 25o 1.2 m R 1.0 ms-1 3.0 kg smooth surface m 5.0 kg pulley cord rough surface P Q 25o Fig 1.1 smooth surface Fig 1.2

4 NYJC 2011 8866/01/J2PRELIM/11 For Examiner’s Use (i) Given that the average frictional force on Q after the cord was cut is 10.7 N, calculate average acceleration of Q as it slides 1.2 m t