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Unformatted text preview: MATH 251 Examination I October 2, 2008 Name: Student Number: Section: This exam has 11 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 point value for each question is in parentheses to the right of the question number. You may not use a calculator on this exam. Please turn off and put away your cell phone. 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: Total: Do not write in this box. MATH 251 EXAMINATION I October 2, 2008 1. (12 points) For parts (a) through (d) below, a list of differential equations is given. For each part, write down the letter corresponding to the equation on the list with the specified proper ties. There is only one correct answer to each part. Afterward also answer part (e). A. y = 2 y 3 16 B. y 00 2 y + 10 y = 0 C. y + ty = e t sin t D. y 00 + 2 t 2 y + 9 y = te 4 t E. y = 6 y t F. y 000 y 2 = 1 G. y 00 + 5 y + y = tan(2 y ) (a) (2 points) First order linear equation that is also separabe. (b) (2 points) First order nonlinear, autonomous, equation. (c) (2 points) Second order nonlinear equation. (d) (2 points) Second order nonhomogeneous linear equation....
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 Spring '08
 CHEZHONGYUAN
 Math, Differential Equations, Equations, Partial Differential Equations

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