<PRE><B>Question 173974</B>
The period T ( time in seconds for one complete cycle) of a simple pendulum is related  the lenght L ( in feet) of the pendulum by the formula 8T^2=pie^2L. If a child is on a swing with a 10-ft chain, then how long does it take to complete one cycle of the swing?
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8T^2=pie^2*L

8T^2 = pi^2 *10
t^2 = (10/8)pi^2

t^2 = (5/4)pi^2

t = [sqrt(5)/2]pi

t = 1.1180..* pi seconds
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Cheers,
Stan H.
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