A heavy uniform chain lies on a horizontal table-top. If the coefficient of friction between the chain and table surface is $0.25$, then the maximum fraction of length of the chain, that can hang over one edge of the table is ...... $\%$
AIPMT 1991, Medium
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(a) $l' = \left( {\frac{{\mu }}{{\mu + 1}}} \right) = \left( {\frac{{0.25}}{{0.25 + 1}}} \right)\;l = \frac{l}{5} = 20\% $ of $l$
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