A uniform chain of length \( \ell \) and mass \( m \) overhangs on a rough horizontal table with...

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A uniform chain of length \( \ell \) and mass \( m \) overhangs on a rough horizontal table with its \( 3 / 4 \) part on the table. The friction coefficient between the table and the chain is \( \mu \). Find the magnitude of work (in joules) done by the friction during the period the chain slips off the table
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