M251ex1(sp07)

M251ex1(sp07) - Name MATH 251 Midterm Exam I March 1 2007...

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MATH 251 Midterm Exam I March 1, 2007 Name: Student Number: Instructor: Section: This exam has 11 questions for a total of 100 points. There are 2 multiple choice questions. In order to obtain full credit for partial credit problems, all work must be shown. Credit will not be given for an answer not supported by work. THE USE OF CALCULATORS IS NOT PERMITTED IN THIS EXAMINATION. At the end of the examination, the booklet will be collected. 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: Total: Do not write in this box.

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MATH 251 Spring 2007 Exam I 1. (6 points) A mass weighing 100kg stretches a spring 5m. If there is no damping, which of the following equations describes the motion of the spring? (a) 100 y 00 + 980 5 y = 0 , (b) 100 y 0 + 5 y = 0 , (c) 100 y 00 + 5 y = sin 9 t, (d) y 00 = cos( y ) , (e) 5 y 00 + 100 y = 0 . 2. (6 points) which equation below describes a system undergoing resonance? (a) y 00 + 4 y = 0 , (b) y 00 + 4 y 0 + 4 y = sin 4 t, (c) y 00 + 9 y = sin 9 t, (d) y 00 = cos( y ) , (e)
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M251ex1(sp07) - Name MATH 251 Midterm Exam I March 1 2007...

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