Homeworks, keys, etc
Homework 12 is posted, as is a key to homework 11.
I've recently seen three videos which all look like great exam questions. Take a look at these, and think about the physics (or lack thereof) behind these:
http://failblog.org/2008/11/19/shopping-cart-fail/
http://failblog.org/2008/11/18/logistics-fail/
http://failblog.org/2008/11/17/cable-fail/
jay-