Question

CCN1049 Physics Semester Two of 2018/159 Question Q3 (25 marks) (a) A string oscillates according to the standing wave equation given below 23 (xt)0.005 sin((30 + ds)rx) cos((40 - d)mt) 37 where x and y are in meters, and t is in seconds. Calculate the followings:- (0 The amplitude and speed of the two transverse waves y,(x.t) and y2Cx,t), identical but travelling in opposite direction, whose superposition gives this y (o, t) oscllation. 4 marks) a= (ii) The distance between nodes of the standing wave. (2 marks) " 1.03 s. 4 marks) (ii) Th netransverseseedoraparticle of the string at the position x-o015 m when t Two trains are travelling towards each other at (40 + de) m/s relative to the ground. One train is blowing a whistle at (256-3 x de) Hz. Given that the speed of sound through the air is 343 (b) m/s, determine the followings:- (i) The frequency heard on the other train in still air (ii) (5 marks) The frequency heard on the other train if the wind is blowing at 30 m/s towards the listener, (5 marks) but away from the whistle. (5 marks) (ii) The frequency heard if the wind direction of part (b) is reversed. 斗 Semester Two of 2018/13 ㏄N1049 Physics』 Qucstion Q4 (25 marks) The figure below shows a gas sa The system changes from state to stat and volume. mple of 48-g mass in a closed system undergoes several processes e at constant volume, then from state to state 3 t pressure, and finally from state back to state at a constant product of pressure P (Pa) 5900 V(m) Given that from 1to 2, the temperature decreases by 355°C, and the specific heat capacity c 649 J/kg K. The internal energy of the system at followings and 3 are the same E E 14740 J. Find the (4 marks) Heat transfer to the system Q1-2 from ① to ② (a) (b) Internal energy of the system E at (c) Work done by the system Wzs from 2 to 3 (d) Heat transfer to the system Qzs from 2 4 marks) (4 marks) 4 marks) to 3. 5 marks) (e) Work done by the system Ws1 from 3 to 4 marks) (f) Total heat transfer to the system Qoyle during the cycle.

Answer 1

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