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Coefficient of static friction between a...

Coefficient of static friction between a coin and gramophone disc is 0.5. Radius of the disc is 8cm . Initially the centre of the coin is `pi cm` cm away from the centre of the disc. At what minimum frequency will it start slipping from there? By what factor will the answer change if the coin is almost at the rim?`(Use g =pi^2ms^-2)`.

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