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Unformatted text preview: Thevalingam, Donald Homework 12 Due: Dec 21 2006, midnight Inst: Eslami 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. Please notice that the due date is on Thurs- day. This assignment and the next one are very heavily counted toward your grade if you are exempt from the final exam. 001 (part 1 of 1) 10 points An object travels 9 m in the first second of travel, 9 m again during the second second of travel, and 9 m again during the third second. What is the approximate average accelera- tion of the object during this time interval? 1. Unable to determine. 2. 5 m/s 2 3. 6 m/s 2 4. 0 m/s 2 correct 5. 4 m/s 2 6. 9 m/s 2 7. 8 m/s 2 8. 7 m/s 2 9. 3 m/s 2 Explanation: Solution: Because the distance traveled each second is constant, its velocity is constant. Therefore, the acceleration of the object is zero. keywords: 002 (part 1 of 1) 10 points A four-engine jet accelerates down the runway at 8 m / s 2 . If one of the jet engines fails, how much acceleration will the other three produce? Correct answer: 6 m / s 2 . Explanation: Since four engines produce an acceleration of a , each produces one-fourth of the origi- nal acceleration and three of the engines will produce three-fourths of the original acceler- ation. keywords: 003 (part 1 of 1) 10 points A car traveling initially at 7 . 7 m / s accelerates at the rate of 0 . 899 m / s 2 for 3 . 3 s. What is its velocity at the end of the accel- eration? Correct answer: 10 . 6667 m / s. Explanation: Use the kinematic equation v f = v + a t keywords: 004 (part 1 of 2) 10 points The electrons that produce the picture in a TV set are accelerated by a very large electric force as they pass through a small region in the neck of the picture tube. This region is 2 cm in length, and the electrons enter with a speed of 100000 m / s and leave with a speed of 1 . 5 10 8 m / s....
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