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25 replies

LucMeekes23-Emerald IV
23-Emerald IV
May 12, 2020

Converted to Prime2

 

Luc

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ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
May 12, 2020

Thanks

But with error!

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LucMeekes23-Emerald IV
23-Emerald IV
May 12, 2020

What error? It opens with no problems in my Prime 2 Express...

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ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
May 13, 2020

See please new version of sheets in attach.

Mathcad 15 gives as more informative error message.

Mathcad Prime 5 gives as old not informative error message.

Help please!

May be the math model is wrong?

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ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
May 13, 2020

If t.end is very small I have solution.

Now I have not 4 but 3 equation!

Help please!

See please attach

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LucMeekes23-Emerald IV
23-Emerald IV
May 13, 2020

Prime 2 version attached.

 

Luc

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    ValeryOchkov24-Ruby IVAuthor
    24-Ruby IV
    May 13, 2020

    sorry luc

    I do not ask to convert 15 into prime

    I ask to help  me   in solution

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    AlanStevens19-Tanzanite
    19-Tanzanite
    May 13, 2020

    Hmm!  I'm not sure I like your yoyo Val, so I've come up with one of my own!  See below and the attached (M15 version):

     

    g0.jpg

    g1.jpgg2.jpg

     

    Alan

     

    I know! I know! I haven't included units.  I haven't provided an animation.  I haven't done the upward movement.  I'll leave that to whoever is interested! 

     

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      ValeryOchkov24-Ruby IVAuthor
      24-Ruby IV
      May 13, 2020

      Thanks, Alan!

      I am glad that I gave you the pleasure to solve this problem.

      But I would like to see ODEs solution - not problem, but SuperProblem!

       

      Why me sheets with Odesolve have errors?

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      AlanStevens19-Tanzanite
      19-Tanzanite
      May 14, 2020

      Ok Val, I've modified your worksheet so that it works.  The solver was confused in particular by F(t) and the explicit inclusion of the energy equation (which is there implicitly in the other terms).  See my modifications below, and the attached for the complete file (M15).

       

      g0.jpgg1.jpg

       

      Alan

       

       

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        ValeryOchkov24-Ruby IVAuthor
        24-Ruby IV
        May 15, 2020

        Too few equations! Why? Prime 5 in attach!

        Too-few.png

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        ValeryOchkov24-Ruby IVAuthor
        24-Ruby IV
        May 15, 2020

        Too many initial conditions! Why? Mathcad 15 in attach.

        Too-many.png

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        AlanStevens19-Tanzanite
        19-Tanzanite
        May 15, 2020

        Deleted as irrelevant!

         

        Alan

         

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