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Math Help - Need help on the conservation of energy Eq

  1. #1
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    Need help on the conservation of energy Eq

    hi people..
    I've been trying to unravel this equation, but i have not been successful.. I could use some help..

    The equation is the application of the conservation of energy law..

    (m/2) [(Rx' + Rx'cos(x))^2 + (-Rx'sin(x))] + mg(R+ Rcos(x)) = (m/2)(v^2) + mg2R

    I guess i should really learn how to use Latex. Anyway, the x' represents the derivative of x, m the mass, g the gravity force.

    I know it unravels to (x')^2 = (4gR(sin(x/2))^2 + v^2) / (4(R^2)(cos(x/2))^2), but i can't get there..

    Thanks!
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  2. #2
    Newbie
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    May 2011
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    After spending yesterday evening trying i couldn't do it, today, 10 mins after posting it, i got it..
    For all of you who were going to try, thanks..

    Rock on!
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  3. #3
    A Plied Mathematician
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