The final 3 homework assignments are Specific Heat, Sound Waves , and Wave Chacteristics. Notice that they are posted along with their worked answers. Also, I have posted the final practice test and answers and will post worked solutions later today. Check out the following website for helpful reading for the assignments:
http://www.glenbrook.k12.il.us/gbssci/phys/Class/waves/wavestoc.html
and also:
http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/spht.html