MasteringPhysics2a

MasteringPhysics2a - MasteringPhysics: Assignment Print View

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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignmentI. .. 1 of 11 10/4/2007 3:29 PM [ Print View ] PHCC 141: Physics for Scientists and Engineers I - Fall 2007 2a. One Dimensional Kinematics Due at 11:59pm on Thursday, August 30, 2007 Hide Grading Details Number of answer attempts per question is: 5 You gain credit for: correctly answering a question in a Part, or correctly answering a question in a Hint. You lose credit for: exhausting all attempts or requesting the answer to a question in a Part or Hint, or incorrectly answering a question in a Part. Late submissions: reduce your score by 100% over each day late. Hints are helpful clues or simpler questions that guide you to the answer. Hints are not available for all questions. There is no penalty for leaving questions in Hints unanswered. Grading of Incorrect Answers For Multiple-Choice or True/False questions, you lose 100% / ( # of options - 1 ) credit per incorrect answer. For any other question, you lose 3% credit per incorrect answer. NOTE: Beginning with this assignment you will have only 5 wrong answer attempts and the past deadline ramp down of credit is 24 hours past due. 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 Use your intuition. You know that as a ball rolls down a ramp, its speed increases, and a a ball rolls up a ramp, its speed decreases. You also know that the faster the ball is traveling, the less time it will take to cover a given distance. 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
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MasteringPhysics: Assignment Print View http://session.masteringphysics.com/myct/assignmentPrint?assignmentI. .. 2 of 11 10/4/2007 3:29 PM Part C Select from the graphs pictured the one that most plausibly represents the graph of x velocity vs. time. 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
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This note was uploaded on 10/28/2008 for the course PH 141 taught by Professor Toki during the Fall '08 term at Colorado State.

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MasteringPhysics2a - MasteringPhysics: Assignment Print View

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