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 . The work done in pulling the entire chain on the table is

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 . The work done in pulling the entire chain on the table is, 7 . 2 J, 3 . 6 J, 120 J, 1200 J

MARKS App · Accepted Answer

Mass per unit length= M L = 4 2 = 2 k g m - 1 The mass of 0.6 m of chain = 0.6 × 2 = 1. 2 k g ∴ Center of mass of hanging part h = 0.6 + 0 2 = 0.3 m Hence, work done in pulling the chain on the table =work done against the gravity force W = m g h = 1.2 × 10 × 0.3 = 3.6 J

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