S: 3 youngc Tue 16 Apr 2013 PHYSICS QUESTION 8. A stationary siren emits a note of frequency 500Hz as a train moving with a speed of 40m/s approaches. Calculate the frequency of the emitted note that would be received in the train. [Speed of sound wave inair =320m/s] Question 9. State two differences between induction stroke and compression stroke in a four stroke petrolengine. Question 10. a) What is surface tension? b) State two methods by which surface tension of a liquid can be reduced. ANSWER ANY THREE QUESTIONS FROM THIS PART. Question 11.a) i) State the conditions for an oscillatory motion to be considered simple harmonic. ii) Give two examples of systems that can be caused to perform Simple Harmonic Motion. b) A body of mass 0.30kg is made to perform simple harmonic motion with a period of 2.50s and amplitude of 0.04m. Calculate the maximum; i) velocity of the particle ii) acceleration of theparticle iii) energuly associated with the motion c) If the motion in (b) is described by theequation x = P sin Qt, determine the values of the constants P and Q. [Take pi = 3.142] 12. a) Define specific heat capacity of a substance. b) i) Describe an experiment to determine the specific heat capacity of a metal by the method of mixtures. ii)State two precautions necessary to obtain accurate results in the experiment described in (i) c) A metal of mass 50g was heated to 100C and quickly transferred into a calorimeter of mass 80g containing 60g of water at 30C. Themixture was stirred continuously until a final steady temperature of 42C was attained. Calculate the specific heat capacity of the metal. [SHC of water = 4200J/kg/k, SHC of calorimeter = 400J/kg/ k, neglect heat losses to the surroundings] 13. a) i. Distinguish between real and virtual image. ii. Show by means of ray diagrams, how each type of image in (a.i.) abovemay be produced by a concave mirror. b) Describe an experiment to determine the focal length of a converging lens using the lens Confirmed. Question 4 Explain what is meant by cations. Draw and label an electrolytic cell Question 2 A particle is projected horizontally at 15ms-1 from a height of 20m. Calculate the horizontal distance covered by the particle just before hitting the ground. Verified Physics OBJ: 1-10: aaabdcdcca 11-20: dbccbbdabc 21-30: cdbcbabdda 31-40: dccbbaccca 41-50: dcdcaccaac
Posted on: Fri, 04 Oct 2013 21:01:40 +0000
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