How Do You Apply the Lagrange Equation to a Hoop at Theta Equals Zero?

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The discussion centers on applying the Lagrange Equation to a hoop at an angle of theta equals zero (θ = 0). Participants emphasize the importance of understanding the position vector before proceeding with the application of the equation. The conversation highlights the necessity for foundational effort from users seeking assistance, adhering to community guidelines for effective collaboration.

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Shahbakht
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Homework Statement
Two equal masses are glued to a massless hoop of radius R that is free to rotate about its center in a vertical plane. The angle between the masses is 2*theta. Find the frequency of small oscillations.

I dont get that if two masses, so where do we take the postion vector from? From the centre?
Relevant Equations
d/dt(dL/dtetha)=dL/dtetga
I couldn't even get the position vector. Help!
 
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Hello Shahbakht, :welcome: !

Can you do it for ##\theta = 0## ? We need some effort from you before we are allowed to assist -- see guidelines
 
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