<PRE><B>Question 204077</B>
The period T (time in seconds for one complete
cycle) of a simple pendulum is related to the length L
(in feet) of the pendulum by the formula 8T^2 = (pie)2L. If a
child is on a swing with a 10-foot chain, then how long
does it take to complete one cycle of the swing? 
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8T^2 = (pi)2*10
T^2 = (20/8)pi
T = sqrt[(20pi/8]
T = 2.8.. seconds
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Cheers,
Stan H.
</PRE>