(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Three identical spheres of radius r are at rest at the bottom of a spherical bowl of radius R. If a fourth sphere is placed on top, what is the largest ratio R/r for equilibrium if there is no friction?

2. Relevant equations

Obviously F_net=0 since the sphere are in equilibrium, however I'm not sure how to start. Could somebody tell me how to begin?

3. The attempt at a solution

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# Homework Help: Challenging statics problem

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