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Member

Join Date: Feb 2009
Posts: 6

problem

05/04/2009 4:38 PM

Is there anyone who can solve this set of equations?

1) d^2x/(dt)^2 = x*SQRT(x^2+y^2)

2) d^2y/(dt)^2 = y*SQRT(x^2+y^2)

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Anonymous Poster
#1

Re: problem

05/05/2009 2:15 AM

Yes

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Guru

Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#2

Re: problem

05/05/2009 9:13 AM

It can be solved by

a) lot of us, not much difficult really.

b) Quite a few of your class.

c) Solution will be presented on the day you have to submit the answer.

d) Similar problems might be there in your books. These look to be one of the simpler set of equations.

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Member

Join Date: Feb 2009
Posts: 6
#3
In reply to #2

Re: problem

05/06/2009 12:42 AM

1) since no one answered I'd take it that no one can

2) nobody in my class could cuz I study physics, and my classmates aren't much into math

3)it's not a question for class, so I don't need to submit it, it's a project I'm working on and I need mathematical help that's why I wrote the question in the first place

4)no there aren't similar ones in my books cuz we don't need second order equations usually... and my books are mainly about physics

and I'd appreciate it if u could help me, if not plz don't comment

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Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
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#4
In reply to #3

Re: problem

05/06/2009 6:43 AM

Hello dj poni

If you take the negative sqrt, a solution is x = a*cos(t), y = a*sin(t) (as you can easily check). This is the parametric equation of a circle, radius a.

I can't find a solution for the positive sqrt, but maybe somebody else can.

Cheers........Codey

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