Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2000
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2000

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

Search the Archive

Units

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23718] Units
  • From: "Enrique Cao" <cao at mundo-r.com>
  • Date: Mon, 5 Jun 2000 01:09:13 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi:

I need help in order  to solve this problem.

I have the vector aceleration {3 t Meter/Second^2,t^2 Meter/Second^2}. 
This is a vector dependent of time (t).

I want to get the  position vector with initial conditions {x[0]==2 
Meter,y[0]==5 Meter,x'[1]==2 Meter/Second,y'[1]==3 
Meter/Second}.

I do this with the follow  expression:

<< Miscellaneous`Units`

<< Miscellaneous`SIUnits`

DSolve[{x''[t]==3 t Meter/Second^2,y''[t]==t^2 Meter/Second^2, 
x[0]==2 Meter,y[0]==5 Meter,x'[1]==2 =
Meter/Second,y'[1]==3 Meter/Second },{x[t],y[t]},t]

The solution is

{x[t]->(Meter(4 Second^2+ 8 Second t +t^3 ))/(2 Second^2),

y[t]->Mter(3+(6 t)/Second+t^4/(12 Second^2))}

The unit of position is Meter but the  solution is not correct.

How can I get the correct solution ??

Thank you very much

    Henrique

cao at mundo-r.com


  • Prev by Date: fractional number
  • Next by Date: Round off or up
  • Previous by thread: RE: fractional number
  • Next by thread: Re: Units