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JEE Main & Advanced Physics Simple Harmonic Motion Question Bank Simple Pendulum

  • question_answer
    If the length of second's pendulum is decreased by 2%, how many seconds it will lose per day   [CPMT 1992]

    A)            3927 sec                                 

    B)            3727 sec

    C)            3427 sec                                 

    D)            864 sec

    Correct Answer: D

    Solution :

                       \[T\propto \sqrt{l}\]Þ \[\frac{\Delta T}{T}=\frac{1}{2}\frac{\Delta l}{l}=\frac{0.02}{2}=0.01\]Þ\[\Delta T=0.01\,T\]            Loss of time per day \[=0.01\times 24\times 60\times 60\]\[=864\sec \]


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