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A heavy uniform chain lies on horizontal table top. If the coefficient of friction between the chain and the table surface is 0.25, then the maximum fraction of the length of the chain that can hang over one edge of the table is:

1. 20%
2. 25%
3. 35%
4. 15%

Correct answer: 25%

Solution

The maximum fraction of the chain that can hang is determined by balancing the frictional force on the table with the weight of the hanging part. Using the condition for limiting equilibrium, the fraction is equal to the coefficient of friction, which is 0.25 or 25%.

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