### Physics Help Online with the TI-89 Calculator: Video Transcript

This is a video from every step physics dot com demonstrating how my programs work with the t i 89 titanium calculator and other calculators in the t i system for physics and calculus problems ah this is better than physics help on line because you download the programs right into you calculator and you have all the help you need ah for what I’ve programmed which is quite a bit and let’s get started on how they work you press second alpha to put p h y s i c s in the entry line of the calculator press alpha to put the open and closed parenthesis press enter and you’re into my menu

many things here for your help on line whatever you have to

choose what you want and uhm do center of mass here

ah here’s the formula center of mass is the

sums of these ecetera and I give you the choice of

two masses or two masses in the x y plane

three masses x axis three masses x y plane

four masses x y plane let’s do number four

three masses in x y plane first mass

you have to put alpha before you enter anything into the entry

lines of my programs here alpha eight first mass

we’ll say it’s kilograms I give you that choice though

alpha twelve kilograms

and here’s the third one alpha six kilograms

first coordinate x equals four

meters second coordinate

the y alpha

let’s go minus six meters

second coordinate for the x value alpha seven

meters and then the y value

alpha minus four meters third coordinate

alpha seven meters alpha six meters

I show you the whole thing that you’ve entered so you can

change it if you want if you’ve made a mistake

we’ll say it’s ok and you’re doing the sums of these

remember and here’s the calculations

write everything down on your paper just as you see it

like you’re doing the calculations yourself center of mass is six point zero eight meters

and the x y z is equal to six point zero eight zero zero

pretty neat huh every step physics dot com

go to my site buy my programs

and pass your physics