Lecture video / office hours today

Based on the poll response so far, I'll begin taking video (and audio) of the lecture portion of class starting tomorrow. I would have started yesterday already, but forgot the mic ...

If you are having trouble with the homework problems for tomorrow, I'll be in my Bevill office and mostly available after 2pm today. Failing that, I should be in my Gallalee office for the hour before class tomorrow.

Finally ... the notes I posted contain a huge hint for problem 9 on the homework. For problem 8, first find the acceleration vector, and then note that

a_t = \vec{a}\cdot\hat{T} = \vec{a}\cdot\frac{\vec{v}}{|\vec{v}|} = \frac{\vec{a}\cdot\vec{v}}{|\vec{v}|}

and

a_n^2 = |\vec{a}|^2 - a_t^2