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Thread: Mechanics (Pendulum) Question

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    Mechanics (Pendulum) Question

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    Re: Mechanics (Pendulum) Question

    b)
    (dividing the 2 equations from part a)

    (from triangle formed by pendulum)

    remove r at bottom and divide by R to get answer

    c)
    cos a is between a certain region; where it is equal or less than 1 or greater or equal to min value of cosa which occurs when a is max;



    a steps away from answer
    Last edited by mrbunton; 30 Sep 2018 at 7:51 PM.

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    Re: Mechanics (Pendulum) Question

    Quote Originally Posted by mrbunton View Post
    b)
    (dividing the 2 equations from part a)

    (from triangle formed by pendulum)

    remove r at bottom and divide by R to get answer

    c)
    cos a is between a certain region; where it is equal or less than 1 or greater or equal to min value of cosa which occurs when a is max;



    a steps away from answer
    why is the lower bound? thanks
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    Re: Mechanics (Pendulum) Question

    when a is max; cosa is minimum. a is max when it is right on the edge of the bowl; so height of ball is h; we take R-h to find the adjacent side of the triangle. hence R-h/R is equal to cosa at its minimum value
    Last edited by mrbunton; 30 Sep 2018 at 8:19 PM.

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    Re: Mechanics (Pendulum) Question

    Quote Originally Posted by mrbunton View Post
    when a is max; cosa is minimum. a is max when it is right on the edge of the bowl; so height of ball is h; we take R-h to find the adjacent side of the triangle. hence R-h/R is equal to cosa at its minimum value
    rip, i completely missed that the vertical length is R as well. thanks again!
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