final - Version 118 final e xam- - markert- - (58840) 1...

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Unformatted text preview: Version 118 final e xam- - markert- - (58840) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Identify the parameter paths for an ideal gas that are isovolumetric / isobaric / isothermal. P V A C B T 1 T 2 T 3 T 1 > T 2 > T 3 1. A / B / C 2. C / B / A 3. C / A / B 4. A / C / B correct 5. B / A / C 6. B / C / A Explanation: A is isovolumetric since volume is constant. B is isothermal since temperature is constant. C is isobaric since pressure is constant. 002 10.0 points A wheel rotates about a fixed axis with an initial angular velocity of 97 rad / s. During a 8 s interval the angular velocity increases to 136 rad / s. How many revolutions does the wheel turn through during this time interval? Assume the angular acceleration was constant during this time interval. 1. 66.8451 2. 164.725 3. 73.6092 4. 77.8268 5. 115.308 6. 29.762 7. 24.8282 8. 57.057 9. 98.2782 10. 148.332 Correct answer: 148 . 332 rev. Explanation: Let : i = 97 rad / s , f = 136 rad / s , and t = 8 s . From kinematics f = i + t = f- i t , so the angle is = i t + 1 2 t 2 = i t + 1 2 f- i t t 2 = 1 2 ( f + i ) t = 1 2 (136 rad / s + 97 rad / s) (8 s) 1 rev 2 = 148 . 332 rev . 003 10.0 points The four figures below represent sound waves emitted by a moving source. Which picture represents a source moving at a speed greater than zero but less than the speed of sound? Waves emitted later than the original wave have smaller radii. 1. Version 118 final e xam- - markert- - (58840) 2 correct 2. 3. 4. Explanation: Consider the wavefront created when the source at the center of circle 1 has traveled the distance between lines 1 and 3 and the wave- front created when the source at the center of circle 2 has traveled the distance between lines 2 and 3. 1 2 3 This means that the source had to move at exactly the speed of the sound waves; other- wise the wave emitted at 2 would not catch up with that emitted at 1. The result of this motion at the speed of sound is a piling up of sound waves in front of the source at 3. When the wavefronts are concentric, the source is stationary. When later wavefronts do not catch up with earlier wavefronts, the source is moving at a speed slower than the speed of sound. When later wavefronts have moved beyond those emitted earlier, Version 118 final e xam- - markert- - (58840) 3 the source is moving faster than the speed of sound. 004 10.0 points What is the volume of 4 . 1 mol of an ideal gas at a pressure of 3 atm (1 atm = 101300 Pas- cals) and a temperature of 0 degrees Celsius? 1 liter = 0.001 m 3 ....
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final - Version 118 final e xam- - markert- - (58840) 1...

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