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A seconds pendulum goes slow by 1 min 40...

A seconds pendulum goes slow by 1 min 40 s a day. What should be the change in its length so that it will give the correct time? `(g=980cm.s^(-2))`

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The correct Answer is:
decrease length by 2.3 mm (approx.)
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CHHAYA PUBLICATION-SIMPLE HARMONIC MOTION-PROBLEM SET - II
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  16. The time period of a simple pendulum is T. When the length is increase...

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