http://www.ies.co.jp/math/java/calc/rotate/rotate.html

cylindrical shell movie,
gif format

finding
volume using other types of sections.

Extra Stuff not related to ch 6:

other
calculus demos from mathdemos.org

Taylor's
polynomial to approximate y = cos (x) near x = 0

Taylor's
polynomial to approximate y = e^x near x = 0