Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people seem to miss the homework subforum at the TOP of the PF list. So here is a remind. If you have posted these types of questions in here (or any other physics main section) and you can't seem to find them anymore, chances are, they have been MOVED to where they should have been. Here's a link to the Homework & Coursework Questions forums: https://www.physicsforums.com/forumdisplay.php?f=152 Zz.