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nijhu

  • 3 years ago

|dw:1349516917936:dw|

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  1. hartnn
    • 3 years ago
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    draw it out again

  2. nijhu
    • 3 years ago
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    ok

  3. nijhu
    • 3 years ago
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    |dw:1349517106533:dw|

  4. hartnn
    • 3 years ago
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    u need to evaluate that ? its w.r.t du , right ? which topic does this question belong ?

  5. nijhu
    • 3 years ago
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    i need to solve this by using convollution theorem

  6. nijhu
    • 3 years ago
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    it is a laplace transform

  7. hartnn
    • 3 years ago
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    Laplace or Fourier ? F = Fourier generally

  8. nijhu
    • 3 years ago
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    we r following th e book laplace transform by spiegel

  9. nijhu
    • 3 years ago
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    and the topic is alpplications to differential equations by using inverse laplace

  10. nijhu
    • 3 years ago
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    anyone got my answr

  11. nijhu
    • 3 years ago
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    ?

  12. hartnn
    • 3 years ago
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    \(\large \frac{s}{5}\frac{5}{(s^2+9)(s^2+4)}= \quad \frac{s}{5}\frac{(s^2+9)-(s^2+4)}{(s^2+9)(s^2+4)}\) now just separate denominator. got it ?

  13. nijhu
    • 3 years ago
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    |dw:1349520425747:dw|

  14. hartnn
    • 3 years ago
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    don't include s. lets just do partial fraction for 1/(s^2+4)(s^2+9) after that we multiply s to both terms

  15. hartnn
    • 3 years ago
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    |dw:1349520610397:dw|

  16. nijhu
    • 3 years ago
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    hmmm then?

  17. hartnn
    • 3 years ago
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    what vales of A and b u got ?

  18. nijhu
    • 3 years ago
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    A=1/85 and B=1/25

  19. hartnn
    • 3 years ago
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    how ! 1= A (s^2+4) + B (s^2+9) put s^2 = -9 1= A (-9+4) 1= A (-5) A = -1/5 got this ?

  20. hartnn
    • 3 years ago
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    similarly find B

  21. nijhu
    • 3 years ago
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    B=1/5

  22. hartnn
    • 3 years ago
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    thats correct. so now u got where that 1/5 came from ?

  23. nijhu
    • 3 years ago
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    lol....

  24. nijhu
    • 3 years ago
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    got it

  25. nijhu
    • 3 years ago
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    u r very helpfull

  26. nijhu
    • 3 years ago
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    thanks a lot man!

  27. hartnn
    • 3 years ago
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    welcome ^_^

  28. nijhu
    • 3 years ago
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    |dw:1349522140539:dw|

  29. hartnn
    • 3 years ago
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    thats just separation of variables, which step did u not get ?

  30. nijhu
    • 3 years ago
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    (s^2+4)dy/ds+sy=0....how did the minus sign cancel out?

  31. nijhu
    • 3 years ago
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    |dw:1349522675157:dw|

  32. nijhu
    • 3 years ago
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    |dw:1349522813018:dw|

  33. hartnn
    • 3 years ago
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    u r rite, even i don't see, how they got that + maybe printing mistake in book.....

  34. nijhu
    • 3 years ago
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    my sir showed us a similar problem where the condition Y(0)=1,Y(pie)=0 and Y'(0)=c

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