Question

1
55. A heavy chain of length 1 m and weight 20 kg hangs
vertically with one end attached to a peg and carries a
block of mass 10 kg at the other end. Find the work done
in winding 50 cm of chain round the peg.
a. 85J b. 100 J e. 120 J d. 125 J
56. In the above question, find the height by which the centre
of mass of the system of 'chain + block' rises.
a. 0.417 m b. 0.437 m c. 0.365 m d. 0.405 m​

Answer 1

Answer:

Correct option is

D

125 J

COM of the upper half of the chain goes up by 25 cm, COM of the lower half of the chain goes up by 50 cm and the mass goes up by 50 cm. Work done in this process is 

m1gh1+m2gh2+m3gh4

=10⋅10⋅10025+10⋅10⋅10050+10⋅10⋅10050J

=125J

Answer 2

ANSWER....

55..OPTION D..

125J....

56.. OPTION A..

0.417 m...

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