MATH 251 Midterm: MATH 251 PSU M251Exam 2(su06)
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This exam has 10 questions for a total of 100 points. 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. Math 251 summer 2006 exam ii: (8 points) consider a mass-spring system described by the di erential equation. 2u + u + 8u = 2 sin( t). What is the laplace transform of y(t)? (a) y (s) = (b) y (s) = (c) y (s) = (d) y (s) = 1 s2 s2(s2 + 4) s2 + 1 s2(s2 + 4) s3 + 1 s2(s2 + 4) Page 2 of 9: (5 points) what is the inverse laplace transform of. Math 251 summer 2006 exam ii (a) 3et cos 2t .
