1. The problem statement, all variables and given/known data http://img510.imageshack.us/img510/5505/systemet4.jpg [Broken] What I wish to do is to relate the accelerations of the loop an the massive block. I know the angle theta at any instant. I also know that the acceleration of the loop on the fixed support is a. I have been given no other information except the figure and I have to write out the acceleration of the block. My teacher says its a cos theta But I cannot express the expression of the block in just two variable of a and theta. I also need the perpendicular distance of the fixed support from the pulley. please help me!