1. The problem statement, all variables and given/known data Basically, one must find the acceleration of the system as well as the tension within the strings. http://img98.imageshack.us/img98/6108/physicsyx7.th.jpg [Broken] 2. Relevant equations EF = ma Ff = muFn Also the angle between the string and the top of the block is 78 degrees. 3. The attempt at a solution Well I drew out the FBD for the block with 47 kg. I equated Fn to FTx (Tension in the x direction). I am totally stuck now. Help plz.