SteikeTa
Member
+153|6757|Norway/Norwegen/ Norge/Noruega
Ok, I've got this problem: https://img177.imageshack.us/img177/741/photo2mx5.th.jpg

Now, this is the function for the air pressure x km above sea level. p is messured in mm Hg (milimeters)

Question is, calculate how high above sea level are we when the pressure is 700 mm Hg.
As you can see, this is equations with natural log, ln

The answer is supposed to be: 658 m, but I can't figure out the way to the answer :S



Need help with this one, please Detailed step by step answer would be lovable!

(Guess I put 700 for x in p(x), right?) But after that....

Last edited by SteikeTa (2009-02-08 11:56:48)

Gooners
Wiki Contributor
+2,700|6642

I haven't seen you in ages
SteikeTa
Member
+153|6757|Norway/Norwegen/ Norge/Noruega

Gooners wrote:

I haven't seen you in ages
Studying ya know!
Then I remembered that I always got a lot of help at this forum, so... why not use it
Flaming_Maniac
prince of insufficient light
+2,490|6717|67.222.138.85
700/760 = e-.125x

ln(700/760) = -.125x(lne)

lne = 1

(ln(700/760))/-.125 = x

.657905 km = x

657.905 m = x
SteikeTa
Member
+153|6757|Norway/Norwegen/ Norge/Noruega

Flaming_Maniac wrote:

700/760 = e-.125x

ln(700/760) = -.125x(lne)

lne = 1

(ln(700/760))/-.125 = x

.657905 km = x

657.905 m = x
Thank you very much, Flaming! Forgot that the answer I first get is in km, and that I have to give it in m... ffs! Obrigado!!

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