Simple pendulum of large length is made equal to the W radius of the earth. Its period of oscill...

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Simple pendulum of large length is made equal to the
W radius of the earth. Its period of oscillation will be :
(1) \( 84.6 \mathrm{~min} \).
(2) \( 59.8 \mathrm{~min} \).
(3) \( 42.3 \mathrm{~min} \).
(4) \( 21.15 \mathrm{~min} \).
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