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5.Work, Energy, Power and Collision
normal
A uniform chain of length $2\,m$ is kept on a table such that a length $60\,cm$ hangs freely from the edge of the table. The total mass of chain is $4\,kg$. The work done in pulling the entire chain on the table is ............. $\mathrm{J}$ (Take $g = 10\,m/s^2$)
A
$12.9$
B
$6.3$
C
$3.6$
D
$2$
Solution
Work done to Pull the chain
$\mathrm{W}=\left(\mathrm{mg} \frac{\ell}{2}\right)$
where $\mathrm{m} \rightarrow$ mass of hanging part
$\ell \rightarrow$ length of hanging part
$\mathrm{W}=\left(\frac{4}{2} \times 0.6\right) 10 \times(0.3)=3.6 \mathrm{J}$
Standard 11
Physics
