Re: Why No Solution Using Solve?

*To*: mathgroup at smc.vnet.net*Subject*: [mg33931] Re: [mg33902] Why No Solution Using Solve?*From*: "Eric L. Strobel" <fyzycyst at comcast.net>*Date*: Tue, 23 Apr 2002 07:14:19 -0400 (EDT)*Reply-to*: fyzycyst at mailaps.org*Sender*: owner-wri-mathgroup at wolfram.com

on 4/22/02 12:57 AM, Tom Compton at comptont at concentric.net wrote: > Why doesn't this give a solution? > > Solve[{ > m1 a1 == P1/ v1 - A1 Rho Cd (v1 + w)^2 /2 - m1 g Cr1 - m1 g S, > m2 a2 == P2/ v2 - A2 Rho Cd (v2 + w)^2 /2 - m2 g Cr1 - m2 g S, > m3 a3 == P3/ v3 - A3 Rho Cd (v3 + w)^2 /2 - m3 g Cr1 - m3 g S}, > {Cr1, S, w} > ] > I'm sure others will answer the algebra question, but what caught my eye was that these look like equations of motion, which are usually stated as differential equations. Perhaps if you describe the physics problem you're trying to solve? BTW, I notice that you don't really have separate quantities Cr1 & S, but rather a single quantity (Cr1 - S), so you're really only solving for two variables. - Eric. -- Eric Strobel (fyzycyst at NOSPAM^mailaps.org) ===================================================================== Design is an iterative process. The necessary number of iterations is one more than the number you have currently done. This is true at any point in time. =====================================================================