This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Thevalingam, Donald Homework 12 Due: Dec 21 2006, midnight Inst: Eslami 1 This printout should have 14 questions. Multiplechoice 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 fourengine 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 onefourth of the origi nal acceleration and three of the engines will produce threefourths 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....
View
Full
Document
 Spring '08
 Turner
 Physics, Work

Click to edit the document details