Work, Power and EnergyHard
Question
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 tabe. If g is acceleration due to gravity, the work required to pull the nanging part on the table is
Options
A.MgL
B.MgL/3
C.MgL/9
D.MgL/18
Solution
Mass of hanging portion is
(one third) and centre of mass c, is at distance h = 
below the table top. Therefore required work done is, W = mgh =
(g) 
= 
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