Laws Of Motion Question 369

Question: A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is [Kerala PET 2005]

Options:

A) $ \frac{3}{4} $

B) $ \frac{1}{4} $

C) $ \frac{2}{3} $

D) $ \frac{1}{2} $

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Answer:

Correct Answer: D

Solution:

$ {{\mu } _{s}}=\frac{\text{Lenghtof the chain hanging from the table }}{\text{Length of the chain lying on the table}} $

$ =\frac{l/3}{l-l/3}=\frac{l/3}{2l/3}=\frac{1}{2} $



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