Did i take this derivative of the vector right?

mr_coffee

Hello everyone, i just want to check to see if this derivative of the vector is right, I can't access maple and i don't have a ti-89 so i can't check!
here it is:
http://show.imagehosting.us/show/798..._-1_798939.jpg

Pengwuino

Check that domain section...

mr_coffee

ahh should be r >0 right? is the derivative right too? thanks!

Pengwuino

No. Look what happens to the i vector when you have t=3

mr_coffee

oh f word....
can i say, t < 0?

Pengwuino

Well, the thing is that it can go above 0... but how far?

Start looking at the equations and ask yourself where each one has a valid result. For example, the i component can be t=<2