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Math Help - Wave length of a Pendulum

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    Senior Member sakonpure6's Avatar
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    Wave length of a Pendulum

    Hi, I have the following problem.

    Pendulum A is 20 cm long and has a 5g mass on it. Pendulum B is 30 cm long and has 10g mass on it. Which one has a faster period?
    First of all, does the mass of the pendulum matter at all? and if not then I I would need to find the time in both cases and divide by 1 right? Using the equation d=v1t+0.5at^2




    Time Pendulum A= 0.20 s which means that the period is 0.20 s.
    Time Pendulum B= 0.25 s which means that the period is 0.25 s.


    Am I right? Thank you in advance.
    Last edited by sakonpure6; April 17th 2013 at 04:38 PM.
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  2. #2
    Forum Admin topsquark's Avatar
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    Re: Wave length of a Pendulum

    Quote Originally Posted by sakonpure6 View Post
    Hi, I have the following problem.



    First of all, does the mass of the pendulum matter at all? and if not then I I would need to find the time in both cases and divide by 1 right? Using the equation d=v1t+0.5at^2




    Time Pendulum A= 0.20 s which means that the period is 0.20 s.
    Time Pendulum B= 0.25 s which means that the period is 0.25 s.


    Am I right? Thank you in advance.
    The distance formula you used can be used to derive the following:
    T = \frac{1}{2 \pi} \sqrt{L/g}
    where L is the length of the pendulum.

    -Dan
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