M251ex2(sp03)

# M251ex2(sp03) - MATH 251 Spring 2003 Exam 1 April 4 2003...

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MATH 251 Spring 2003 Exam 1 April 4, 2003 NAME : ID : INSTRUCTOR : There are 10 questions on 9 pages. Please read each problem carefully before starting to solve it. For each multiple choice problem 4 answers are given, only one of which is correct. Mark only one choice. For partial credit questions, all work must be shown - credit will not be given for an answer unsupported by work. N O CALCULATORS ARE ALLOWED . P LEASE DO NOT WRITE IN THE BOX BELOW . 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: Total:

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MATH 251 Spring 2003 -MidTerm Exam 2- 1. (6 points) The second order linear equation y 00 - 2 y 0 + 3 y = 0 is equivalent to (a) ( x 0 1 = x 2 x 0 2 = - 3 x 1 + 2 x 2 (b) ( x 0 1 = - x 1 x 0 2 = 3 x 1 - 2 x 2 (c) ( x 0 1 = x 2 x 0 2 = 3 x 1 - 2 x 2 (d) ( x 0 1 = x 1 x 0 2 = - 3 x 1 + 2 x 2 2. (6 points) Which of the following is the Laplace transform of t sin(2 t ) ? (a) - 2 ( s 2 +4) 2 (b) 4 s ( s 2 +4) 2 (c) s s 2 +4 (d) 3 s 2 ( s 2 +4) Page 2 of 9
MATH 251 Spring 2003 -MidTerm Exam 2- 3. (6 points) Let g ( t ) = tu 1 ( t ) -

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M251ex2(sp03) - MATH 251 Spring 2003 Exam 1 April 4 2003...

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