2) For this exercise, you must make sure that the angle between the vertical and the pendulum is a SMALL angle (less than about 10 degrees). Devise a way to make sure that you do not pull the pendulum back more than 10 degrees. 3) Pull the pendulum back and then release it. Using the stopwatch, measure the amount of time required for the pendulum to go through 10 complete oscillations (or periods), tm. T10 : i S 4) Using the obvious formula, T = tlof 10, compute the period (T). Write down an expression for the uncertainty in T. There should only be one term involving l20. Calculate AT and record it below