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Limit problem

  1. Oct 26, 2009 #1
    Question in link, I can't seem to get this one.

    http://img190.imageshack.us/img190/3941/limith.jpg [Broken]

    Everything inside the parenthesis should go to zero and the first part should be 164.54.

    I then multiply (.55)*(164.54) and set that equal to the original equation. I tried solving for t, but can't seem to get the correct answer... help please.
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Oct 26, 2009 #2

    Mark44

    Staff: Mentor

    Since your terminal velocity is obtained directly from 181/1.1, set (1 - e-24.2t/181) equal to .55 and solve for t.

    IOW
    1 - e-24.2t/181 = .55
    .45 = e-24.2t/181

    Do you know what to do now?
     
  4. Oct 26, 2009 #3
    I took the natural log of both sides and still got the same answer...

    ln(.45)=(-24.2t)/181
    (-.7985)*181 = (-24.2t)
    -144.52/-24.2=t
    5.9723=t

    ... that's the answer I got originally and it tells me its not the right answer. gRR~
     
  5. Oct 26, 2009 #4

    Mark44

    Staff: Mentor

    I get the same numbers you get, so I don't understand why the form is complaining.

    Talk to your prof/teacher.
     
  6. Oct 26, 2009 #5
    Thank you, I'll talk to him tomorrow.

    I just wanted to make sure I wasn't doing anything wrong.
     
  7. Oct 26, 2009 #6
    Sometimes these computerized forms take into account significant figures. Make sure that isn't the problem.
     
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