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

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Discussion Overview

The discussion revolves around issues experienced with a TI-89 calculator, specifically regarding unexpected outputs when calculating with certain variables. Participants also touch upon the necessity of differential equations in relation to physics concepts.

Discussion Character

  • Technical explanation, Conceptual clarification, Homework-related

Main Points Raised

  • Angela reports that her TI-89 calculator outputs {} for long answers when using variables other than x, particularly w.
  • Angela later identifies that the issue arose because someone loaded programs into her calculator, causing w to represent the wronskian, suggesting she needs to use a different variable.
  • Another participant explains that variables such as x, v, a, and m are generally not constants and are time-dependent, which relates to the need for differential equations.
  • Angela expresses confusion about the relationship between force equations, specifically questioning the difference between F=m*a and F=d(m*v)/d(t), and seeks clarification on why m*a equals d(m*v)/d(t).

Areas of Agreement / Disagreement

The discussion includes multiple viewpoints, particularly regarding the use of differential equations and the nature of variables in physics. Angela's initial calculator issue is resolved, but her questions about differential equations remain open for further exploration.

Contextual Notes

Angela's calculator issue is tied to specific variable assignments and program loading, which may not be universally applicable. The discussion on differential equations involves assumptions about variable behavior over time that are not fully explored.

Who May Find This Useful

Individuals interested in troubleshooting calculator issues, as well as those seeking clarification on the application of differential equations in physics.

amb123
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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.
 
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Ok, it's only with variables other than x, like w.
 
amb123 said:
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.

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.
 
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
 
because in general [itex]x, v, a, m,...[/itex] are not constants, they are time dependend (amongs other things).
 

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