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Unformatted text preview: Principles of Physics II PHY1322 PHY1302 Instructor: Dr. Andrzej Czajkowski Supplementary Final Exam April 17 2008 Closed book exam ANSWER ALL QUESTIONS Duration: 3 hrs RETURN ONLY SCANTRON SHEETS! Harmonic Oscillator 1. The crucial requirement for an object that is part of a mechanical oscillator system is as follows: when acted on by a net force produced by other elements of the system is that the force be____ a. in the same direction as the velocity of the object. b. in the same direction as the displacement of the system. c. in the same direction as the acceleration of the system. d. opposite in direction to the displacement of the object. e. opposite in direction to the velocity of the object. 2. A uniform rod (length L = 1 0 . m , mass = 2 0 . kg ) is suspended from a pivot a distance d = 0 25 . m above its center of mass. The angular frequency in rad/s for small oscillations is approximately a. 1.0. b. 2.2. c. 1.5. d. 4.1. e. 3.5. 3 . A horizontal plank ( m = 2 0 . kg , L = 1 0 . m ) is pivoted at one end. A spring k = 1000 N m ) is attached at the other end, as shown in the figure. Find the angular frequency in rad/s for small oscillations. a. 39 b. 44 c. 55 d. 66 e. 25 Mechanical Waves 4. When a traveling wave reaches a boundary with a medium of greater density, the phase change in radians in the reflected wave is a. 0. b. π 4 . c. π 3 . d. π 2 . e. π . 5. A uniform cord has a mass of 0.6 kg and a length of 12 m. The tension in the cord is 19.6 N. What is the speed of a wave on the cord in m/s? a. 9.9 b. 22.4 c. 4.5 d. 19.8 e. 17.3 Electric Potential and Field 6. Two charges of 15 pC and –40 pC are inside a cube with sides that are of 0.40m length. Determine the net electric flux through the surface of the cube. a. +2.8 N ⋅ m 2 /C b. –1.1 N ⋅ m 2 /C c. +1.1 N ⋅ m 2 /C d. –2.8 N ⋅ m 2 /C e. –0.47 N ⋅ m 2 /C 7 Three point charges are positioned on the x axis. If the charges and corresponding positions are +32 µ C at x = 0, +20 µ C at x = 40 cm, and –60 µ C at x = 60 cm, what is the magnitude of the electrostatic force on the +32 µ C charge? a. 84 N b. 12 N c. 36 N d. 50 N e. 48 N 8 Which of the following represents the equipotential lines of a dipole?...
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 Fall '08
 CZAJKOWSKI
 Physics

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