Thank you Fed Ex and O Jones!
If anyone else is stuck on this problem, this link has good step by step instructions.
http://au.answers.yahoo.com/question/index.php?qid=20070417210641AAQxQtf
Homework Statement
A rotating door is made from four rectangular glass panes, as shown in the drawing. The mass of each pane is 90 kg. A person pushes on the outer edge of one pane with a force of F = 80 N that is directed perpendicular to the pane. Determine the magnitude of the door's...