Question

The pendulum is released from P. It takes 0.2 s to swing from P to Q and takes another 0.2 s to swing from Q to R. The pendulum is at its lowest point at R. What is the frequency of pendulum?

Answer 1

time period for the pendulum to swing from extreme position to the center = 0.2 s + 0.2 s = 0.4 sec.

Time period = 4 * 0.4 = 1.6 sec.
Frequency = 1/1.6 = 0.625 Hz