A chain of length 4 m is kept on a table. 2 m of the chain hangs freely from the table’s edge. The mass of the whole chain is 8 kg. What is the work done to pull the whole chain onto the table? (Assume g = 10m/s^2)(a) 20 J(b) 40 J(c) 60 J(d) 80 JI have been asked this question in class test.This key question is from Work Done by a Variable Force in chapter Work, Energy and Power of Physics – Class 11

A chain of length 4 m is kept on a table. 2 m of the chain hangs freel

1.	A chain of length 4 m is kept on a table. 2 m of the chain hangs freely from the table’s edge. The mass of the whole chain is 8 kg. What is the work done to pull the whole chain onto the table? (Assume g = 10m/s^2)(a) 20 J(b) 40 J(c) 60 J(d) 80 JI have been asked this question in class test.This key question is from Work Done by a Variable Force in chapter Work, Energy and Power of Physics – Class 11
Answer» Correct answer is (B) 40 J The best I can EXPLAIN: MASS per length of chain (p) = 8/4 = 2 kg/m Mass of ‘X’ m of length = 2x kg Force = \(\int_{0}^{2}\)(2x * g)dx = \(\int_{0}^{2}\)20xdx = 40 J.

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