Re-constructed last 40 minutes of T5 podcast.

I re-narrated the T5 lecture's last 40 minutes or so:

1. Doc cam, two pages' worth
2. Discussion of Newton's Third Law
3. Normal forces
4. Curved trajectories, starting chapter 4.

The podcast will be available in a few minutes in our iTunes U area. Unlike most podcasts, this reconstructed podcast is a digital video in QuickTime .mov format. Most of our weekly lectures will be in .m4a enhanced audio, which is much more compact.

Anyway, go take a look.

To help you deal with this delay on the full lecture, I will postpone the due date on HW3 til lunchtime on Thursday, so that everyone has a bit of extra leeway.