ch02-motion-along-a-straight-line

# ch02-motion-along-a-straight-line - 1:10 AM...

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Unformatted text preview: 10/13/08 1:10 AM MasteringPhysics: Assignment Print View Page 1 of 8 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1154414 [ Print View ] Introductory mechanics Chapter 02 - Motion Along A Straight Line Due at 11:59pm on Tuesday, September 16, 2008 View Grading Details Ball on a Segmented Ramp A ball is set rolling on the track shown. At it is released at the very left of the track with velocity to the right. It reaches the evenly spaced positions at later times . Part A Given that the spatial intervals between the various are equal, it is clear that the time intervals , , etc. will probably not be. Which ordering would be possible for these intervals? Hint A.1 How to approach the problem Hint not displayed ANSWER: Parts B, C, and D all refer to the graphs labeled a through f. Part B Select from the graphs pictured the one that most plausibly represents the graph of x position vs. time. Hint B.1 How to approach the problem Hint not displayed ANSWER: a b c d e f Correct, the ball's position increases smoothly. The graph should have no horizontal sections because the ball is never at rest. (A horizontal section implies that for some amount of time, the ball's position does not change.) Part C Select from the graphs pictured the one that most plausibly represents the graph of x velocity vs. time. [ Print ] 10/13/08 1:10 AM MasteringPhysics: Assignment Print View Page 2 of 8 http://session.masteringphysics.com/myct/assignmentPrint?assignmentID=1154414 ANSWER: a b c d e f Correct. First the ball moves with constant speed. Then, as it rolls down the ramp, its speed increases linearly. The ball encounters another flat section, and its speed is once again constant. Finally, as the ball rolls up the ramp, it decelerates. Part D Select from the graphs pictured the one that most plausibly represents the graph of x acceleration vs. time. (Note that the origin of the y axis of the graphs is arbitrary; zero acceleration is not necessarily at the bottom of the graphs.) ANSWER: a b c d e f Correct. Initially, the ball's acceleration is zero. When the ball rolls down the first ramp, its acceleration becomes positive and constant. When the ball encounters the second flat section, its acceleration is once again zero. Finally, as the ball rolls up the ramp, its acceleration is constant and negative. Speed of a Bullet A bullet is shot through two cardboard disks attached a distance apart to a shaft turning with a rotational period , as shown. Part A Derive a formula for the bullet speed in terms of , , and a measured angle between the position of the hole in the first disk and that of the hole in the second. If required, use , not its numeric equivalent. Both of the holes lie at the same radial distance from the shaft. measures the angular displacement between the two holes; for instance, means that the holes are in a line and means that when one hole is up, the other is down. Assume that the bullet must travel through the set of disks within a single revolution.of disks within a single revolution....
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## This note was uploaded on 04/07/2010 for the course PHYS 3163 taught by Professor Pickett during the Spring '10 term at CSU Long Beach.

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ch02-motion-along-a-straight-line - 1:10 AM...

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