(I) How long must a simple pendulum be if it is to make exactly one swing per second? (That is, one complete oscillation takes exactly 2.0 s.)

Solution 29P

One swing per second means Time period is 2 seconds as in one Time period the pendulum swings to and fro.

The period of the simple pendulum (T) = 2 secs.

The equation for period of a simple pendulum.