# Homework Help: Limit problem

1. Oct 26, 2009

### BuGzlToOnl

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. Oct 26, 2009

### 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?

3. Oct 26, 2009

### BuGzlToOnl

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~

4. Oct 26, 2009

### Staff: Mentor

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

5. Oct 26, 2009

### BuGzlToOnl

Thank you, I'll talk to him tomorrow.

I just wanted to make sure I wasn't doing anything wrong.

6. Oct 26, 2009

### Tedjn

Sometimes these computerized forms take into account significant figures. Make sure that isn't the problem.