A simple pendulum is suspended from a ceiling 3.2m high and the bob height from the floor is measured to be 68cm. Calculate the period of small amplitude oscillations of the bob. I converted 68cm to 0.68m. The total length of the pendulum must be 3.2 - 0.68 = 2.52. When working with the period, T = 2 pie x sqrt of l/g, do I use my l as 2.52 or half of it since I'm working out the period of the amplitude? And what does it mean by small amplitude... is it just small because it doesn't fallow for big values of amplitude?