I have a problem here. I stole me a grad student and he didn't really know what to do either. Without further adoo (or whatever), i give you... the problem! There are 3 trucks transmitting on the same frequency. #2 is stationary. #1 moves to the left at velocity v. #3 moves up at velocity v as well. I need to determine the relativistic doppler shift of the signal signal between #3 and #1. We tried to determine a function for the velocity vector seperating #3 and #2 but that got ugly fast and we couldn't do anything there. Any suggestions as to what to do? Mind you, i'm suppose to know just a bit over intro-series modern physics and the 3 semester calculus series.