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Physics-

General

Easy

Question

If the time period of a pendulum is 1 sec, then what is the length of the pendulum at point of intersection of l-T and $l minus T to the power of 2 end exponent$ graph

25 cm
21 cm
22 cm
27 cm

The correct answer is: 25 cm

$T equals 2 pi square root of fraction numerator l over denominator g end fraction end root semicolon T to the power of 2 end exponent equals 4 pi to the power of 2 end exponent fraction numerator l over denominator g end fraction$
$l equals fraction numerator g over denominator 4 pi to the power of 2 end exponent end fraction equals fraction numerator 9.8 over denominator 4 cross times 9.8 end fraction equals 0.25 equals 25 c m$

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