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KCET 2022 Physics Solved Paper
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© examsnet.com
Question : 5
Total: 60
A smooth chain of length
2
m
is kept on a table such that its length of
60
cm
hangs freely from the edge of the table. The total mass of the chain is
4
kg
. The work done in pulling the entire chain on the table is, (Take
g
=
10
m
∕
s
2
)
3.6
J
2.0
J
12.9
J
6.3
J
Validate
Solution:
Mass of the chain lying freely from the table
=
M
1
L
=
4
k
g
×
0.6
2
=
1.2
k
g
The distance of center of mass of chain from the table
=
1
2
×
0.6
m
=
0.3
m
Thus the work done in pulling the chain
=
m
g
h
=
1.2
×
10
×
0.3
J
=
3.6
J
© examsnet.com
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