The equivalent coefficient of friction for a block brake is (a) (4 mu sin theta /(sin theta+theta))
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The equivalent coefficient of friction for a block brake is
(a) \(4 \mu \sin \theta /(\sin \theta+\theta)\)
(b) \(4 \mu \sin (\theta / 2) /[\sin (\theta / 2)+\theta / 2]\)
(c) \(4 \mu \sin (\theta / 2) /(\sin \theta+\theta)\)
(d) \(\mu \sin \theta /(\sin \theta+\theta)\).
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