In my physics class we did an experiment where we timed the oscillations of a lead bob when swung from a small angular displacement and were asked to find the relationship between oscillation time (period) and string length. We were given 4 possible equations and asked to find the right one and I know it is this one "T2 = Al" because the teacher told us but I'm completely lost. Heres some of my results taken Length/m---------Time for 30 oscillations /s 85-----------56.4 72-----------81.9 63-----------48.2 52------------43.9 36-----------36.8 A in the formula was defined as 4pi2/g. We were told to "Examine the data and select the relationship that best fits the experimental data. Plot the appropriate graph of the quantities involved. A straight line graph through the origin confirms that you have selected the appropriate relationship." I'm not quite sure what values to plot this graph with. I tried drawing a graph with T2 as X and Al as Y but I don't know what the origin he's talking about is. I have to write a report on this experiment but I dont really know whats going on so Im stuck.