For homework students should complete the book assignment 7.2 and complete the worksheet that was handed out today (except for #65c).
Check out the video links below for more examples on volumes of solids formed by revolving a region about a vertical line.
http://www.youtube.com/watch?v=fNhLphUjXus
http://www.khanacademy.org/math/calculus/solid_revolution_topic/disc-method/v/washer-or-ring-method-for-vertical-line-rotation