MATH 251 Midterm: MATH 251 PSU s251Exam 1(su11)

• School: PSU
• Department: Mathematics
• Course: MATH 251
• Professor: All

Document Summary

Answer key (a) no (b) yes (c) yes (d) no. !u + 2u = 0, u(0) = (b) = 7 (radians/sec), 2 x 6 y 4 ! x 2 + 2e3y = c (c) 2 x 6 y 4 ! x 2 + 2e3y = !7 (a) Q(0) = 800 . (b) q(t) = 1600 ! = 8 (a) yc = c1 e 4t + c2 te 4t (b) y = c1 e4t + c2 te 4t + 2 e2t (c) y = a cos 4t + b sin 4t + ct 4 + dt 3 + et 2.