MATH 240 Midterm: MATH 240 UPenn 240Fall 07 Exams
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Mathematics 240 j. krieger, n. rimmer, s. shatz. Answer all questions by circling the entire statement you deem correct in each question. No books, tables, notes, calculators, computers or cell phones allowed. You may bring one 8. 5 x 11 sheet of paper bearing any handwritten material you deem necessary and you may use both sides of this paper. Use the backs of your exam pages for scratch work and calculations. (your name please print) (your penn id number) (your signature) (your instructor"s name (print)) Iii) an iron bead is constrained to move along the x-axis and is acted on by a varying magnetic field. The differential equation describing its motion is: x + (1/2) x + 2x = cos(t). Suppose x(0) = 4/5 and x (0) = 2/5, then x(3 /2) equals: a) 4/5 b) 3/5 c) -2/5 d) 2/5 e) -4/5.
