Part A Knowledge (42 marks) Answer on the sheet provided by circling your choice of the list answer. Use g = 10 mls2 for multiple choice. 1. Select the scalar quantity from the following list a. Acceleration b. Displacement c. Force d. Velocity e. Work 2. A plane starting from rest accelerates at a rate of 1.5 m/s2 for 40 s before taking off. The take off speed is: a. 40 m/s b. 50 mfs c. 60 m/s d. 70 m/s e. 120 m/s 3. A book rests on a desk. The reaction to the force of the book on the desk is: a. The force of gravity of the earth on the book b. The upward force of the book on the earth. c. The force of the desk on the oor. (1. The force of the book on the desk. e. The force of the desk on the book. 4. Work is alwa done when: An object has potential energy An object moves A force is applied perpendicular to the direction an object moves A force moves an object A force is exerted on an object. sup-99's 5. A model airplane of mass 1.5 kg moves with a speed of 3.0 m/s, 5.0 m above the ground. The airplane has a potential energy of: a. 6.8 J b. 38 J c. 75 J (1. 80 J c. 82 J 6. A machine with a power rating of 15.0 kW must complete a job requiring an expenditure of 1.50 x 108 J of energy. How long will it take to complete the job? a. 2.25x106s b. 1.00x104s c. 1.00X102s d. 1.00x1015 e. 1.00 s 7. A hiker walks 6.0 m [E] and then 8.0 m [S]. The magnitude of the displacement is: a. 14.0 m b. 1/ 14 m c. 10.0 m d. 2.0 m e. 2.0 m [SE] 8. The distance between successive nodes in a standing wave pattern is: a. 0.25 A b. 0.5 l c. 0.75 x d. 10 K e. 2.0 k 9. A 60 W light bulb was left on for 5.0 h. How much energy did it consume? a. 0083 J b. 12] c. 3.0 x 102 J d. 8.3 x 102 J e 1.1 x 106 J 10. If two 8 ohm resistors are connected in parallel in a circuit, their total resistance will be: a. 0.13 9 b. 0.25 9 c. 4.0 Q d. 16 S2 e. 64 Q 11. A resistance of 12 9 connected to a 24 volt battery would receive a current of: a. 0.5 A b. 2 A c. 24 A d. 36 A e. 288 A 12. A car bulb is connected to a 12 volt battery and has a resistance of 24 Q. The power, in watts, of the bulb is: 2 W 5 W 6 W 24 W 36 W {DP053".\" 13. A single straight conductor carries electrons out of the plane of the paper toward you as shown. What direction and shape are the magnetic eld lines? Clockwise, concentric circles around the conductor Counter-clockwise, concentric circles around the conductor Straight lines radiating outward from the conductor Straight lines radiating in toward the conductor Straight lines directed from left to right 9999'?\" 14. Two of the four diagrams below are correct. Select the correct diagrams. 8m N NMS SEEPIN NW5 1 and 1H are correct 11 and IV are correct I and IV are correct 11 and 111 are correct $1.0 57.\" 15. As shown in the diagram, electrons ow through a copper conductor located between the poles of a horseshoe magnet. Ifthe conductor is free to move it will be forced: Toward the N pole of the magnet Toward the S pole of the magnet Upward, away from both poles Downward towards the yolk of the magnet To rotate counterclockwise rulers 16. Which of the following cannot transmit sound: Alcohol Fibreglass Iron Vacuum Wood rap-.0575 17 . An aircraft ying at a high altitude of 10,000 m where the air temperature is 50C has a speed of MACH 1. The speed of the aircraft is closest to (in km/h) a. 1000 km/h b. 1100 km/h c. 1200 km/h (1. 1300 km/h e. 1800 km/h 18. A transverse wave with a frequency of 6.0 Hz moves at 12 m/s. The wavelength is: a. 0.50 m b. 2.0 m c. 6.0 m d. 18 m e. 72 m 19. A light blinks at a rate of 20 ashes per minute. The frequency of the ashes is: a. 0.33 HZ b. 3.0 Hz c. 3.3 Hz d. 33 Hz e. 1200 Hz 20. A depth finder emits a burst of sound from the bottom of a ship. The time required for the sound to reect back to the ship is 0.20 s. The speed of sound in water at the time was 1400 m/s. The depth of the water under the ship is: a. 1.4 x 102 m b. 2.8 x 102 m c. 7.0 x 102 m d. 7.0 x 103 m e. 1.4 x 104 m 21. Two tuning forks having frequencies of 3 10 Hz and 320 Hz respectively, are sounded together loudly. An observer standing at a point several metres away will hear: Continuous silence A steady loud sound A sound whose frequency is 315 Hz A sound with 20 beats per second A sound with 10 beats per second nap-99's