Solution of a simple Differential Equation

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Discussion Overview

The discussion revolves around solving a system of differential equations involving two dependent variables, x and y, as functions of time t. The equations are presented in the context of analyzing the motion of a particle in a magnetic field.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • Gareth presents a system of differential equations and seeks assistance in solving them, specifically for the position x.
  • One participant questions the formulation of the equations, noting the presence of two dependent variables with only one equation, which seems unusual.
  • A suggestion is made to differentiate the first equation with respect to t and substitute it into the second equation, leading to a third-order homogeneous ODE in y.
  • Another participant indicates they have found the solution independently, suggesting a rapid progression in the discussion.
  • Gareth expresses a realization about confusion regarding boundary conditions, indicating a potential misunderstanding in the problem setup.

Areas of Agreement / Disagreement

The discussion includes some uncertainty regarding the formulation of the equations and the approach to solving them. There is no clear consensus on the best method to proceed, and participants have differing levels of understanding about the boundary conditions.

Contextual Notes

Limitations include the unclear relationship between the dependent variables and the lack of explicit boundary conditions, which may affect the solution process.

gabrown
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Hi,

I was wondering if anyone could help me solve or even know the type of the differential equation below

d2x/dt2= k*dy/dtSorry
I also have

d2y/dt2= -k*dx/dt

where k is a constant.

I need it to find the position x when looking at a particle going through a magnetic field.

Thanks very much

Gareth
 
Last edited:
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Are you sure about the equation? It has two dependent variables, x and y as functions of t. Because you only have one equation this seems strange.
 
Edited.
 
In that case I would suggest differentiating the first ODE with respect to t and then substituting it into the second. Upon substitution, you will obtain a third order homogenous ODE in y which can be solved trivially.
 
I just got the solution on paper. You're too fast Hootenanny...
 
Cheers guys, I think i understand (think i was being a bit dumb) getting confised about my boundary conditions.
 

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