Question 206: Work, Energy and Power & Circular Motion

Question

A uniform chain of length $2$ $m$ is kept on a table such that a length of $60$ $cm$ hangs freely from the edge of  the table. The total mass of the chain is $4$ $kg.$ What is the work done in pulling the entire chain on the table?

Accepted Answer

Mass of hanging part $(m') = {4 \over 2} 	imes \left( {0.6} ight)kg$ = 1.2 kg
Let at the surface $PE=0$
Center of mass of hanging part $=0.3$ $m$ below the surface of the table
${U_i} =  - m'gx =  - 1.2 	imes 10 	imes 0.30$ = - 3.6 J
$\Delta U = m'gx = 3.6 J = $ Work done in putting the entire chain on the table.

Answer

$12$ $J$

Answer

$3.6$  $J$

Answer

$7.2$ $J$

Answer

$1200$ $J$

Work, Energy and Power & Circular Motion

A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?

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