Using the standard equation (1) and value for gravity, g = 9.80 m s−2, presented in physics texts for calculating the pendulums period, we obtain a period value of 1.65 s.
May 2013
Figure 3. Acceleration in the y-direction of the iPod touch in its case with a total mass of 410.69 g and length of 0.675 m
L
T=2π g.