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DESum08Exam1

DESum08Exam1 - APPM 2360 Exam 1 Summer 2008 ON THE FRONT OF...

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APPM 2360 Exam 1 Summer 2008 ON THE FRONT OF YOUR BLUEBOOK write: (1) your name, (2) your student ID number, (3) your lecture section, (4) your instructor’s name and (5) a grading table. You have 90 minutes to work all 5 problems on the exam. Each problem is worth 20 points. Show ALL of your work in the bluebook and box in final answers. Start each problem on a new page. A correct answer with no relevant work may receive no credit, while an incorrect answer accompanied by some correct work may receive partial credit. Text books, class notes and calculators are NOT permitted. One letter size (8 . 5 00 × 11 00 ) crib sheet with anything hand written on both sides is allowed. 1. For each of the following differential equations, determine its order, whether it is linear or nonlinear, and if it is linear determine whether it is homogeneous or nonhomogeneous, and whether the coefficients are constant or variable: a) y 000 + ty 0 = 2 t b) y 0 y = t c) y 00 + yy 0 = 0 d) 3 y 00 + y 0 + y = 16 t 2. Consider the initial value problem: y 0 + 3 t 2 + 1 t y = t , y (1) = 4 3 a) Determine an integrating factor for the differential equation.

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