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AIEEE 2004 Physics Solved Paper
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© examsnet.com
Question : 11
Total: 78
A uniform chain of length
2
m
is kept on a table such that a length of
60
cm
hangs freely from the edge of the table. The total mass of the chain is
4
kg
. What is the work done in pulling the entire chain on the table?
12
J
3.6
J
7.2
J
1200
J
Validate
Solution:
Mass of hanging part
(
m
′
)
=
4
2
×
(
0.6
)
k
g
=
1.2
kg
Let at the surface
P
E
=
0
Center of mass of hanging part
=
0.3
m
below the surface of the table
U
i
=
−
m
′
g
x
=
−
1.2
×
10
×
0.30
=
−
3.6
J
∆
U
=
m
′
g
x
=
3.6
J
=
Work done in putting the entire chain on the table.
© examsnet.com
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