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KEAM 2020 Physics and Chemistry Solved Paper
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© examsnet.com
Question : 3
Total: 120
A solid sphere of radius
r
is revolving about one of its diameters with an angular velocity
ω
.
If it suddenly expands uniformly so that its radius increases to
n
times itsoriginal value, then its angular velocity becomes
n
2
ω
ω
n
2
n
ω
ω
n
2
n
ω
Validate
Solution:
I
1
ω
1
=
I
2
ω
2
2
5
m
r
2
ω
=
2
5
m
(
r
′
)
2
×
ω
2
r
2
ω
=
(
n
r
)
2
ω
2
r
2
ω
=
n
2
r
2
ω
2
ω
2
=
ω
n
2
© examsnet.com
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