1. The problem statement, all variables and given/known data http://img.skitch.com/20091201-pxecs3d574itggpejybhdbp3qr.jpg Essentially, as an experiment, our physics class whirled a stopper attached to a string that went through a tube that was finally attached to a weight on the bottom of the string. 3. The attempt at a solution I'm not really sure, unless the centripetal force is somehow not adequate to hold the weight up, but it should be, as long as the stopper is swung around quickly enough.. This seems contradictory to everything that we've learned about UCM this semester.