So this question is from a physics lab. The apparatus for the experiment was made upon a device that measures angular speed over time. On top of this is a rail to which different items can be attached. Directly in the center of the rail is a device which has a pulley with a string to attached it, and it has an indicator that goes up or down as the apparatus spins; we were told this measures centrifugal force. 16cm away from the center of the rail, is a hanging weight of unknown mass; this mass has hooks on it from which it can hang, attach to the super pulley, and also attach the last weight, which goes over the end of the rail over a pulley and hangs. We put different masses at the end, and then used the pulley device in the center to mark where the indicator hangs; then the mass is taken off, causing the indicator to move. Angular speed was then increased until the indicator moves back to where it was, and using this angular speed and the hanging mass (which was removed before the actual experiment) we are supposed to be able to determine the mass of the hanging object. Sorry for the awful explanation - let me know if more clarification is needed. EDIT: Here is an image of the experimental setup. Anyways, once we had our data, we made a graph of Angular Speed squared (x-axis) and hanging mass (y-axis); this graph was linear and had an equation of y=3.26x+1.31. This graph was made for us based on our data, so even though those axes sound wrong (to me at least), that's how it's supposed to be. Anyways, using the equation for this graph, and the equation written below, we are supposed to be able to determine the experimental mass: M = m * r / g * ω^2 where M is the experimental mass, m is the hanging mass, r is 16.00 cm, and ω/g obviously represent acceleration due to gravity and angular speed (squared). I can not for the life of me figure out how to use these two equations to determine M. Any help greatly appreciated!