Work Power and Energy 1 Question 7
8. A uniform chain of length and mass is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If is acceleration due to gravity, the work required to pull the hanging part on to the table is
(1985, 2M)
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 8. (d)
Solution:
- Mass of hanging portion is
(one-third) and centre of mass , is at a distance below the table top. Therefore, the required work done is,