Question

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

(a) 7.2J  (b) 3.6J (c) 120J  (d) 1200J

Answer 1

(b) : The center of mass of the hanging part is at \(0.3 \mathrm{~m}\) from table
\(1.4 \mathrm{~m}\)
mass of hanging part \(=\frac{4 \times 0.6}{2}=1.2 \mathrm{~kg}\)
\(\therefore \quad W=m g h\)
\(=1.2 \times 10 \times 0.3\)
\(=3.6 \mathrm{~J}\).

Answer 2

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Answer 3

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