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