A heavy uniform chain lies on a horizontal table top. If the coefficient of friction between the chain and the table is 0.25, then the maximum percentage of the length of the chain that can hang over one edge of the table is -
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Let the length of total chain be l
The part which is lying on the table be x and lying outside be y In equilibrium, the frictional force must balance the tension force
Let us take 
as weight per unit length and n as coefficient of friction
We get ntx 
ty
Here we need to find 
Given 
So we get 
Therefore the maximum percentage of chain hanging is 
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