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 *Physics Equations for TI-83(+)*
		V 1.3
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	By Andrew Boughton
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Sections:
-What's New?
 -History
-Intro
-Using
-Editing
-Contact
-Notes
-Equations contained


What's New in V 1.30?:
In Version 1.3, I added one new equation (density), bringing the total number of equations in Phys up to 35. I also went back through the code and played with order of operations a little more, allowing me to rewrite equations and make the program smaller without creating any problems (at least, none I found, and I checked twice. Let me know if you find any problems.) As a matter of fact, this version has more equations than the last one in a SMALLER file size, which is a very nice improvement.

History:
The original Phys program covered 31 equations, and version 1.1 improved on this by offering 10% smaller size (a result of going from using the somewhat repetitive "input" to "prompt") and two minor bug fixes. In Version 1.2 I added three new equations to Phys, and for version 1.25 I made the program smaller AGAIN (noticing a trend here?) and made one or two very minor bug fixes. No equations were added that time. For those who were looking for a different kind of history... hmm. Strom Thurmond is the longest serving senator?


Intro:
This is a physics calculation program, which is able to display and calculate 35 separate equations.  Since I wrote this while taking HS physics, the equations are clustered in some semblance of order- that is, by topics like Motion in a plane or Electrical equations. As I learn more equations I hope to add them to the program and fill in the gaps, as I've done with V 1.3. Any suggestions can be sent to my email address, WPL510@yahoo.com.

Using:
To use the program, you choose the equation from the menus, and input the variables when prompted (to help, it also displays the equation).  Unfortunately, I haven't yet figured out how to have the program really fiddle with the equation and still keep file size small, so it'll only solve for the variable on the left side of the equation (for example, in R=V/I, you can't get "I", only R- but hey, once you know the equation, do it yourself!). If anyone can think of a way to get the calculator to solve for other variables in one equation without just doing all the different versions of an equation (which would probably make the program way too big...), please let me know.

Editing:
It's completely open, so feel free to change things if you need to.  I couldn't input some variables (i.e. "lambda"), so those Greek symbols are denoted by the first letter of how you'd spell them phonetically (so lambda is L).  You're certainly free to change these if you feel that there is a more intuitive letter.  Also, volunteers to port Phys to other calculators are welcome.  If you do make revisions, please email me a copy so that these changes can be made available to all.  However, please refrain from plugging yourself in the program, since one goal is to keep this program as small and convenient as possible.

Contact:
If you have any questions, feel free to contact me by e-mail at WPL510@yahoo.com, with your questions, comments, or revision suggestions.  Also, I maintain page of "completely unrelated stuff" at www.geocities.com/WPL510 .

Notes:
Look below for a list of all the values this program calculates, as well as the equation it uses.  If there's a better one in your opinion- well, that's why you can change it.  I would, however, appreciate if you sent along those revisions as an e-mail attachment (WPL510@yahoo.com), so that I can make it available to all.  :)

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******EQUATIONS CONTAINED******
(in order that they appear)

Acceleration (a=v\t)
Average velocity (v=s/t)
Final Velocity (vf^2=2a*s+vi^2)
Distance (s=.5at^2+vi*t)
Resultant force (fres=m*a)
Kinetic friction (FK=MU*N)
	-next menu
Momentum (p=m*v)
Impulse (j=fres*t)
Work (w=f*s)
Kinetic Energy (ke=.5m*v^2)
Potential Energy (pe=m*g*h)
Power (p=w/t)
	-next menu
Wave Velocity (v=f*lambda)
Force of Gravity (fgrav=(g*m1*m2)/(r^2))
Index of Refraction (n=c/v)
Percent Error (Error=(O-A)/A)
Two-slit experiment- wavelength (lambda=d*x/l)
Focal Length (1/f=1/DI+1/DO)
	-next menu
Radius of Curvature (2F=R)
force of Electrical field (f=kQ1Q2/r^2)
Strength of electrical field (e=f/q or v/d)
Electrical Potential (v=w/q)
Current (I=q/t)
Power in a circuit (p=VI)
	-next menu
Resistance (r=v/i)
Magnetic force (f=Q*V*B=B*I*L)
Energy of a photon (e=h*f)
Kinetic energy of electron (ke=h*f-w)
Work function (WK=H*F0)
Energy of an emitted photon (W=VQ)
	-next menu
Particle Wavelength (Lambda="L"=h/p or h/(m*v))
Centripedal Acceleration (Ac=(V^2)/r)
Centripedal Force ((Fc=(MV^2)/r)
Mass after nuclear half-lives (Mi/(2^n))
Density (D=M/v)
Quit Program
	-end menu
	-end of program