A chain (uniform) of mass m and length l has a small block of mass M attached to one of…
Physics · JEE Advanced · NTA Exams — Work, Energy and Power
A chain (uniform) of mass m and length l has a small block of mass M attached to one of its ends and hangs from the surface of a table, with one-third its length resting on it. It is pulled by a constant horizontal force to lift the block slowly to the table surface. The work done by the force is
- (M + m)g\(\left(\frac{2 \ell}{3}\right)\)
- \(\left(M+\frac{m}{3}\right)\left(\frac{g \ell}{3}\right)\)
- \((M+m)\left(\frac{g \ell}{3}\right)\)
- \(\left(M+\frac{m}{3}\right)\left(\frac{2 g \ell}{3}\right)\)
Answer
(D) (M+ m 3 ) ( 2 g 3 )
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