s251ex1(su09)

s251ex1(su09) - = t 4 ≠ 0 7 y = C 1 t C 2 t-2 8 sin cos 2...

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MATH 251 Exam I July 16, 2009 ANSWER KEY 1. (a) E (b) H (c) D (d) A 2. 1 2 - = t e y 3. (a) Q 50 Q + = 8, Q (0) = 100 (b) Q ( t ) = 400 - 300 e - t / 50 (c) 400 ) ( lim = t Q t 4. (a) (0, ) (b) t t y 2 1 64 1 3 - = 5. (a) y = 3 e t - e 4 t (b) - = ) ( lim t y t 6. W ( y 1 , y 2 )( t
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Unformatted text preview: ) = t 4 ≠ 0 7. y = C 1 t + C 2 t-2 8. ) sin( ) cos( ) ( ) 2 sin( ) 2 cos( 2 2 1 t F t E e Dt Ct t B t A e C e C y t t t + + + + + + + =-9. (a) iii (b) y = e t + t e t...
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