Lagrange equation, of a hoop?

Shahbakht

Poster warned about not providing an attempt at a solution
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?
Homework Equations
d/dt(dL/dtetha)=dL/dtetga
I couldn't even get the position vector. Help!

Last edited by a moderator:
Related Introductory Physics Homework Help News on Phys.org

BvU

Homework Helper
Hello Shahbakht, !

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

• DrClaude

"Lagrange equation, of a hoop?"

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving