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Calculators Messed up my TI-89 somehow, don't want to reset, any suggests for {}?

  1. Nov 3, 2004 #1
    Messed up my TI-89 somehow, don't want to reset, any suggests for {}??

    I don't know what I did, but now anytime my answer is going to be long, I get {} as an answer, nothing in between. Any thoughts?

    :(
    Angela.
     
  2. jcsd
  3. Nov 3, 2004 #2
    Ok, it's only with variables other than x, like w.
     
  4. Nov 3, 2004 #3
    Ok, sorry guys, I have found the problem. Someone loaded programs into my calculator and w now stands for wronskian, i'll need to use another variable.

    thx.
    Angela.
     
  5. Dec 7, 2004 #4
    Can someone tell me why differential equations are needed?
    I can calculate with integrals. There I know that I can calculate the Area.

    F=m*a in F=d(m*v)/d(t) or something like that.
    where's the different if I write F=m*a or F=d(m*v)/d(t)
    Can somebody explan me that (and explain me, why m*a=d(m*v)/d(t))
    (I know that a=s/t^2 and with that a=v/t)
    Sorry for all these questions. arghh
     
  6. Dec 7, 2004 #5
    because in general [itex]x, v, a, m,...[/itex] are not constants, they are time dependend (amongs other things).
     
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