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A disc with a flat small bottom beaker placed on it at a distance R from its center is revolving about an axis passing through the center and perpendicular to its plane with an angular velocity ω . The coefficient of static friction between the bottom of the beaker and the surface of the disc is μ . The beaker will revolve with the disc if :

1. R ≤ 2 2 μg ω
2. R ≤ 2 μg ω
3. R ≥ 2 2 μg ω
4. R ≥ 2 μg ω

Correct answer: R ≤ 2 μg ω

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