<PRE><B>Question 149821</B>
The period T(time in seconds for one complete cycle) of a simple pendulum is related to length L (in feet) of the pendulum for the formula 8T^2 = PIE^2L. 
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If a child is on a swing with a 10-foot chain, then how long does it take to complete on cycle of the swing? 
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8T^2 = (pi)^(2*10)
8T^2 = 62.83...
T = sqrt[62.83/8] = 2.8 seconds
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Cheers,
Stan H.
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