So I have this problem set for my "introductory" physics class, I'm completely lost.  It is only 10 questions.  Could anyone please help me with this?  This is the first question of the set:

You should be able to use your shortwave radio to summon help, but first you need to know exactly where you are in the pacific. Using a plumb-bob (a weight attached to a string) you bang a stick into the ground exactly vertical. Since it is a sunny day you wait until the shadow of the stick indicates that the sun is directly overhead. You look at your electronic watch which shows that it is exactly midnight, Greenwich Mean Time (the exact time it is in Greenwich, England at 00 longitude). What is your longitude?

Thanks so much!

Last edited by greeny7707 (2008-05-03 05:26:18)