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5.Work, Energy, Power and Collision
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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 .............. $\mathrm{J}$
A
$7.2$
B
$3.6$
C
$120$
D
$1200$
Solution
$\mathrm{W}=\frac{\mathrm{mg} \ell}{2 \mathrm{n}^{2}}$ where $\mathrm{n}=\frac{200}{60}=\frac{10}{3}$
$\mathrm{W}=\frac{4 \times 10 \times 2 \times 9}{2 \times 10 \times 10}=3.6 \mathrm{J}$
Standard 11
Physics
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