Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Integration Problem

• To: mathgroup at smc.vnet.net
• Subject: [mg102004] Integration Problem
• From: JerrySpock <liquidsolids at hotmail.com>
• Date: Sun, 26 Jul 2009 03:55:13 -0400 (EDT)

Hello, everyone.

I'm having a problem integrating to find an arc length.

I have two parametric equations:

x=e^(2t)

and

y=e^(1.5t)

I'm looking for the arc length from 1 to 2.

N[
Integrate[
Sqrt[
(2Exp[2*m])^2 + (1.5Exp[1.5*m])^2
],{m, 1, 2}]]

I keep getting the answer 79.6, but my TI-83 says the answer is 49.8.  I've been playing with this for hours, and I can't get it to work.  Any ideas what I'm doing wrong?

    [Edited by: admin on Jul 25, 2009 7:22 AM]

• Follow-Ups:
  • Re: Integration Problem
    • From: Patrick Scheibe <pscheibe@trm.uni-leipzig.de>
  • Re: Integration Problem
    • From: Syd Geraghty <sydgeraghty@me.com>