need help determined time to travel a path
- To: mathgroup at smc.vnet.net
- Subject: [mg107512] need help determined time to travel a path
- From: "bwalker at musings.com" <brad2000 at gmail.com>
- Date: Mon, 15 Feb 2010 05:47:53 -0500 (EST)
I am trying to determine the time to travel a circular path. This path is on a circle. It's fairly easy to understand. But, I can't seem to figure out why this is failing. (* define my parametrizations *) circlex[t_]:=13+13*Sin[t+pi]; circley[t_]:=13+13*Cos[t+pi]; (* the derivatives *) dcirx[t_]:=D[circlex[t],t]; dciry[t_]:=D[circley[t],t]; (* amount of time needed to travel a circle *) Integrate[Sqrt[(dcirx[t])^2+(dciry[t])^2]/Sqrt[2*g*(circley[time0]- circley[t])], {t, 0.01, pi/2}] I get a negative value for the time. This can't be right.. Any help is much appreciated!! Thanks. Brad Walker
- Follow-Ups:
- Re: need help determined time to travel a path
- From: Murray Eisenberg <murray@math.umass.edu>
- Re: need help determined time to travel a path
- From: Brad Walker <bwalker@musings.com>
- Re: need help determined time to travel a path
- From: Tomas Garza <tgarza10@msn.com>
- Re: need help determined time to travel a path