Post your ideas for new science programs here, or build on ideas posted by other visitors.

First of all I think there should be an engineering section. There is a program on this site but it doesn't work with the ti-89. The program is Aerodynamics Tool - aero.zip. It only works for the ti-92, I was wondering if someone would port it to the ti-89 or if there is a simple fix that I can do to get it to work. This will realy help me in my compressible fluid flow class. Or if there is a program that someone is aware of that is very simular please let me know.

I've been looking for a program that does exactly what ME*Pro and EE*Pro does exept that it lets you put your own equations in. I have still not found it...

I'd like to create my own equations and input desired variables (with "Enter: 'variable namne" at the bottom and help picutre on F4). Anyone who has played around with ME*Pro and EE*Pro know what I'm looking for.... please help me. :)

jimmy-westberg AT spray DOT se

Is it possible to monitor ECGs on the Graph Calculators? If yes, how? If no, why not?

I have completed a "suite" of physics equations for the TI84, TI84SE, and TI83. The program covers the basic projectile motion formulas (range, time, and height), addition of vectors (up to 4), tension, and vector coordinates.
Because of the nature of the program, while it has 5 programs pre-installed, you can add an additional 5 formulas into it.
Any suggestions of additional formulas that could be added would be greatly appreciated. I'm currently working on a program that calculates acceleration derived from the formula Vf^2 = Vo^2+2AD.
Many thanks!

I am trying to learn basic programming.. I have a ti 84 plus silver/new ti inspire/ and a used ti 89..
I am in biotech and really need some advice, if you have a program suites of physics... that would work on one of those.. I would be so grateful.. I am looking other places too and if something new will post it..Thank you

I think that a program that makes the lewis dot structures of compounds would be really useful. Somebody make it please. :)

there is one.. you can draw them out.. go to Vesper.org... its a trial version...but its great to download and use

Ok, so, I have gotten into writing programs for my calculator recently.

I was wondering if there was a way to get the calculator to solve for an unknown in a program.

For example:
the classic physics formula:

(Vf)^2 = (Vi)^2 + (2)(a)(d)
Vf = final velocity
Vi = initial velocity
a = acceleration (9.8 m/s^2)
d = distance

Say I was missing "d" from the formula and wanted the program to solve for it...but I have everything else. How do I program it to solve for "d", the missing variable, or any other variable that is not given?

I'd like to know this so I can write out some programs for my AP Physics calss on my own.

Any help is appreciated
My email is
crabnebula1@verizon.net

Thanks,

Chuck

This may not be the most elegant solution to your problem, but just don't show it to anyone if you're embarrassed about it, and it should work just fine for you:

Prompt for the three variables, and require that "e" be entered for the unknown. That's Euler's number, above the divide key. Then test for a value of "e" among the inputs, and calculate the result accordingly. Your code would then look something like this:

Input F, I, D
If F=e and I#e and D#e
Then Disp I^2 + 19.6*D
Else If etc, etc, Else Disp "Exactly one of F, I, D must be e."

The reasoning for using "e" rather than zero for the unknown is that conceivably one of the knowns could be zero.

--Richard

I could be wrong but i believe that you can have the answer be a letter variable. Something like U for unknown or even the entire word UNKNOWN. You could do this by putting the phrase into quotations and having it in your coding exactly how you would want it to be. So it would look something like this:

:Disp "VF^2=VI^2+2AD
:Input "VF:",F
:Input "VI:",I
:Input "A:",A
:Input "D:",D
:If F="UNKNOWN" Goto 1
:If I="UNKNOWN" Goto 2
:If A="UNKNOWN" Goto 3
:If D="UNKNOWN" Goto 4
:Lbl 1
:Disp "VF=",��(I^2+2AD)
:Stop
:Lbl 2
:Disp "VI=",��(F^2-2AD)
:Stop
:Lbl 3
:Disp "A=",(F^2-I^2)/2D
:Stop
:Lbl 4
:Disp "D=",(F^2-I^2)/2A
:Stop

Im going to try this out on my calculator later and I'll let you know if it works or not.

those messed up a symbols were supposed to be square root symbols but i guess it didnt translate correctly

Yeah so I tried it as storing "U" for the unknown variables and it doesnt work because you cant store script in a variable. It just changes it to a number variable. Using e is probably going to be the easiest way to do it though. One other possibility would be to make a Menu. It would look something like this (I put % signs where you should put square root symbols and obviously you should use the calculators squared symbol instead of ^2 to save space.There are also some spaces in the Menu part that are not needed but I had to put them in to avoid being over 40 characters in one word):

:ClrHome
:Menu("VF^2=VI^2+2AD" ,"UNKNOWN VF",1 ,"UNKNOWN VI",2 ,"UNKNOWN A",3 ,"UNKNOWN D",4
:Lbl 1
:Input "VI:",I
:Input "A:",A
:Input "D:",D
:Disp "VF=",%(I^2+2AD)
:Stop
:Lbl 2
:Input "VF:",F
:Input "A:",A
:Input "D:",D
:Disp "VI=",%(F^2-2AD)
:Stop
:Lbl 3
:Input "VF:",F
:Input "VI:",I
:Input "D:",D
:Disp "A=",(F^2-I^2)/2D
:Stop
:Lbl 4
:Input "VF:",F
:Input "VI:",I
"Input "A:",A
:Disp "D=",(F^2-I^2)/2A
:Stop

P.S.: I tried this one out already and it does work. Going to try to make much larger program that will include D=1/2(VI-VF)T, VF=VI+AT, and D=VI(T)+1/2A(T^2)

Hi Chuck, The easiest way I have found in order to solve an unknown is quite simple. Lets just cut to the chase shall we?

If you want to solve the distance first thing is first, you must know the formula. In this case, it is d = ½(at)
or d = (at)/2, whereas t = time

Look at the program below to solve the distance:

:Prompt A,T
:(AT)/2→D
:Disp"DISTANCE IS",D
:

This program is fairly simple and should be a great deal of help to you.

If you ever need any help with physics equations, then I am the guy to come to.

Sincerely,
BluePhoenix

I can envisage a program so versatile most of the existing solutions would be deprecated.
Imagine if you could program an equation from a data booklet into a String variable, then have a program interpret it and ask you for each term. Whichever term you entered as "?" it would then rearrange the formula to find, and solve your equation for you.
Sure, it's a complicated process, but somehow I don't think it's beyond the capabilities of the device. I'd be willing to pay $20 if anyone actually codes it! As unlikely as I know that is to be.
Thanks!
Peter

I wouldn't mind getting ahold of a TI-89T or a Voyager 200 to write celestial mechanics programs in BASIC. On my computer, I've written programs to solve

1. The ephemeris problem. The geocentric position of a planet in spherical coordinates: R, right ascension, declination. The inputs? The orbital elements of the planet and a time.

2. The calculation of elliptical transfer orbits and the delta-vees for departure and arrival.

3. The calculation of hyperbolic transfer orbits and the delta-vees for departure and arrival.

4. The determination of a preliminary orbit (e.g., for an asteroid) from three angle-only observations - right ascension and declination - by the method of Gauss.

5. The prediction of eclipses.

6. The evolution of a planet/asteroid heliocentric position and velocity in the restricted two-body problem, with reasonably a small time step.

7. Many body problem for high accuracy check of Keplerian orbit solution, if practical - it is computationally intensive.

The thing is, I already have a computer, and it works just fine. GWBASIC, double precision, 1.8 Gigahertz CPU, all the RAM I want. I just think it might be fun to have these programs on a calculator, so I could carry it around with me.

Maybe I could afford one of the TI-89 Titanium or Voyager 200 that people are selling on eBay.

is your programs on windows xp? I just bought a ti inspire that downloads and works with computer programs... trying to learn the programming sequence.
I just bought a used ti 89 titantium.. because my ti 84 doesn't do radicals square roots.. you can do them but it will not give you an answer back in sqaure root form...

IF anyone could give me tips as to how to program stoichiometry on my Ti-83+ I'd be really grateful, I've made basic atempts yet my inexperience stalls me...I don't seem to get the good answer. If you have a detailed tutorial to do such a program plz send it to aild.tom.aild@gmail.com...thx!

what i actually need ids the codes...

Would like a formula that allows me to plug in a variable that is missing and the ones that i have adn it gives me a result.

Hi, I have recently taken interest in creating programs that can perform Robert Boyle's Gas Law, Charles' Gas Law, and the Combined Gas Law for the TI-83 Plus. The problem is, I don't know how to separate the final variables from the initial variables. For instance, I know that for Boyle's Law:

Final Volume = Initial Volume × Initial Pressure ÷ Final Pressure or V₂ = V₁ × P₁ ÷ P₂

OR

Final Pressure = Initial Pressure × Initial Volume ÷ Final Volume or P₂ = P₁ × V₁ ÷ V₂

How would I go about Creating the subscript characters and attaching them to V, P, and T to create V₁, V₂, P₁, P₂, T₁, and T₂

Here is what my programs will currently looks like on paper:

PROGRAM 1(Boyle's Law for Calculating Gas Volume)
:Prompt V₁, P₁, P₂
:(V₁P₁)/P₂→V₂
:Disp"FINAL GAS VOLUME IS",V₂
:

It is not the best program, but I am new to this whole Calculator programming bit. I am much better at programming video games. I am open to suggestion.