the t for a number of complete oscillations is taken. It is found that the time for 20 complete oscillations is 36.5+-0.2s.
% error in T =% error in t although t=T/20
So 0.2/36.5 =(delta)t/t
Example:
The period of oscillation, T, of a simple pendulum is related to its length, l, by the formula T=2pi sqrt(l/g). To find experimentally the accerleration of free fall by using in simple pendulum, a student takes the following measurements:
time for 10 oscillations: 13.8+-0.2s
length of the pendulum: 0.472+-0.001m
ANS:9.8+-0.3m s^2
