A uniform chain of length L and mass M is lying on a smooth table and one third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is
(a) MgL (b) MgL/3
(c) MgL/9 (d) MgL/18
Answer: D
(7)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)