You are pushing your nephew on

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You are pushing your nephew on a playground swing. The
swing seat is suspended from a horizontal bar by two light chains. Based
on your experience with swings, estimate the length of each chain. Treat
the motion of the child as that of a simple pendulum and assume that for
safety the amplitude of the motion is kept small. You give your nephew
a light push each time he reaches his closest distance from you. How
much time elapses between your pushes?

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