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MathGroup Archive 2013

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Re: steady state concetration

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129626] Re: steady state concetration
  • From: "Louis Talman" <talmanl at gmail.com>
  • Date: Thu, 31 Jan 2013 20:45:21 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
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  • References: <20130131030512.C1B196842@smc.vnet.net>

On Wed, 30 Jan 2013 20:05:12 -0700, jeremy <j.witoslawska at gmail.com> wrote:

> Hi,
> i'm new in Mathematica and i've a project to do. i've to find at what  
> time 90% of the steady state concetration of C is achieved. and soo far  
> i have something like that, for 3 different k values:
>
> With[{k = 0.3}, eqn1s = 0 == k (1/2 - z[t]) (1/3 - z[t])];
> With[{k = 0.6}, eqn2s = 0 == k (1/2 - z[t]) (1/3 - z[t])];
> With[{k = 0.9}, eqn3s = 0 == k (1/2 - z[t]) (1/3 - z[t])];
> Evalute[{eqn1s, eqn2s, eqn3s}]
> NSolve[Evaluate[{eqn1s, eqn2s, eqn3s}], z[t]]
>
> and what i get in NSolve is supposedly be the steady state, but i don't  
> know how to find this 90% and my profesor told me that i could try do  
> this with DSolve, but something doesn't work. i hope that someone will  
> be able to help me with this.
>
> Thanks
>

The purpose of this list isn't that of solving people's homework problems  
for them.

  If your professor wanted someone to tell you how to work the problem,  
don't you think *he* would've told you how to work it?

-- 
--Louis A. Talman
   Department of Mathematical and Computer Sciences
   Metropolitan State University of Denver

   <http://rowdy.msudenver.edu/~talmanl>



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