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In a certain observation we get l =23.2 ...

In a certain observation we get `l =23.2 cm,r=1.32cm` and time taken for 20 oscillations was 20.0 sec. Taking `pi^2=10,`find the value of g in proper significant figures.

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The correct Answer is:
B
Equivalent length of pendulum,
`L =23.2 cm+1.32 cm=24.52cm`
=`24.5 cm` (according to addition rule of significant figures)
Time period,` T=(20.0)/(20)=1.00 s`. Time period has `3` significant figures
Now, `g = (4pi^2)l/(T^2)=(4xx10xx24.5xx10^-2)/(1.00)^2=9.80 m//s^2`.
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