Posted by **ridhi** on Friday, April 20, 2012 at 6:24am.

The length l of a simple pendulum is about 0.5m, and can be measured within 1mm. what accuracy is required in the measurement of periodic time T of 100 oscillations if the error in l and T are to produce equal percentage in the calculation of acceleration due to gravity (g)

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**drwls**, Friday, April 20, 2012 at 7:04am
The length L measurement relative error is 1/500 = 0.2%

g = L*(200 pi)^2/T^2

The relative error in T should be 0.1% if its contribution to total error equals the relative error in L.

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**Anonymous**, Thursday, April 26, 2012 at 7:21am
thanks!!

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**ridhi**, Sunday, April 29, 2012 at 5:49am
thanks alot...it was an easy method :)

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